P0755 on 2008-2014 Dodge Avenger: Shift Solenoid 'B' Malfunction Causes and Fixes

What's Unique About the 2008-2014 Dodge Avenger

The 2008-2014 Dodge Avenger, particularly models with the 2.4L and 2.7L engines, often uses the A604/41TE 4-speed automatic transmission. A known characteristic of this transmission is that the shift solenoids are bundled together into a single, replaceable unit called a solenoid pack or block. This means that even though the code points to solenoid 'B' (the 2-4 solenoid), you must replace the entire pack. This design simplifies replacement but means a single solenoid failure requires buying the whole assembly. Later models with the 3.6L V6 often have the 6-speed 62TE transmission, which also uses a solenoid pack, but it is a different part and can be more problematic.

Symptoms You May Notice

• Harsh, jerky, or delayed shifting between gears.
• Transmission getting stuck in one gear (limp mode), almost always 2nd gear.
• Failure to shift into 3rd or 4th gear.
• Vehicle hesitates or slips out of gear.
• Check Engine Light is on.
• PRNDL indicator may flash or not display correctly.
• Reduced fuel efficiency.

Most Likely Causes

1. Failed Shift Solenoid Pack 🔴 High Probability The solenoid pack in the 41TE/A604 transmission is a very common failure point due to heat stress and the degradation of internal electrical coils over time. It is the most frequent cause of P0755.
   How to confirm: A mechanic can use a high-end scan tool to command the solenoid and watch its response. A multimeter can also be used to check the resistance of the solenoid's coil through the transmission connector pins. 🎬 Watch: A simple guide on how to test a transmission solenoid. For the 41TE, the resistance for the shift solenoids should be between 1 and 3 ohms. If the resistance is out of spec, the pack is bad.
   Typical fix: Replace the entire transmission solenoid pack. This part is located on the front of the transmission, behind a cover pan.
   Est. part cost: $100-$250
2. Low or Dirty Transmission Fluid 🟡 Medium Probability Chrysler transmissions are notoriously sensitive to fluid type and condition. Using anything other than the specified Mopar ATF+4 fluid, or running the fluid when it's low or full of debris, can cause blockages in the valve body and prevent solenoids from operating correctly.
   How to confirm: Check the transmission fluid dipstick (if equipped) for level and condition. The fluid must be at the correct level, bright red, and not smell burnt or contain visible debris. Dark, burnt-smelling fluid indicates a more serious problem.
   Typical fix: Perform a transmission fluid and filter change using only Mopar ATF+4 or a licensed equivalent. If the fluid is very dark or contains metal shavings, it may indicate a more severe internal transmission problem requiring a rebuild.
   Est. part cost: $60-$140
3. Faulty Wiring or Connectors ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness leading to the transmission solenoid pack for any signs of chafing, melting, or corrosion, especially at the main connector. A multimeter can be used to check for continuity from the TCM connector to the transmission connector and to check for shorts to ground or power.
   Typical fix: Repair or replace the damaged section of the wiring harness or clean the connectors with electrical contact cleaner and apply dielectric grease.
   Est. part cost: $20-$150

Rare But Worth Checking

• Faulty Powertrain/Transmission Control Module (PCM/TCM): This is uncommon but documented. The driver circuit within the module that controls the solenoid can fail. Diagnosis involves using an oscilloscope to verify the command signal is missing from the PCM/TCM, even when the wiring and solenoid are good. In some cases, replacing the module is the only fix.
• Internal Transmission Failure: A clogged hydraulic passage in the valve body or a failure of an internal clutch pack can cause gear ratio error codes that may appear alongside P0755. This is usually accompanied by other symptoms like severe slipping, loud noises, and significant metal debris in the transmission pan.

Diagnosis Steps

1. Check the transmission fluid level and condition. Ensure it is filled with ATF+4 fluid. Top off or change if necessary.
2. Scan the computer for any other transmission-related codes. Note if P0700 is present, as this is expected.
3. Inspect the transmission wiring harness and the main 8-pin connector for any visible damage, corrosion, or loose pins.
4. Using a multimeter, test the resistance of the 2-4 solenoid (Solenoid 'B') at the transmission connector. A reading between 1-3 ohms is expected for a good solenoid. An open or shorted reading indicates a failed solenoid pack.
5. If possible, use a scan tool to monitor the live data of shift solenoid 'B' and command it to turn on and off to check for a response.
6. If the solenoid pack and wiring test good, the fault may be with the Powertrain Control Module (PCM). Advanced diagnostics using an oscilloscope may be needed to confirm the PCM is not sending the signal to the solenoid.
🎬 See how a mechanic diagnosed a bad PCM on an Avenger.
7. If the solenoid pack tests bad, drain the transmission fluid and remove the transmission pan to access and replace the solenoid pack. It is highly recommended to also replace the transmission filter and pan gasket at this time.

Parts You'll Likely Need

• Transmission Solenoid Pack (41TE/A604) (OEM #5140429AA) — This is the most common cause for a P0755 code on this vehicle, as the internal solenoids fail over time.
  Trusted brands: Mopar, ATP, Rostra, Dorman
  OEM price range: $210-$260
  Aftermarket price range: $80-$150
• Automatic Transmission Fluid (ATF+4) (OEM #68218057AB (or equivalent licensed ATF+4)) — Fluid must be drained and refilled when the transmission pan is dropped. A typical pan drop requires 4-5 quarts. Using the correct ATF+4 fluid is critical for Chrysler transmissions.
  Trusted brands: Mopar, Valvoline, Castrol
  OEM price range: $12-$18 per quart
  Aftermarket price range: $8-$13 per quart
• Transmission Filter and Pan Gasket Kit (OEM #4412842 (Filter), 2464324 (Gasket)) — It is standard and highly recommended practice to replace the filter and gasket anytime the transmission pan is removed.
  Trusted brands: Mopar, Wix, Fram
  OEM price range: $30-$50
  Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

• P0700 — P0700 is a generic code that means the Transmission Control Module (TCM) has stored a fault code. It almost always appears alongside a more specific transmission code like P0755 to indicate the nature of the problem.
🎬 Vea este video sobre el diagnóstico del circuito del solenoide 41TE.

Technical Service Bulletins (TSBs) & Recalls

• TSB 21-013-12: Released for 2012-2013 models, this TSB involves reprogramming the PCM to address harsh shifting complaints (e.g., harsh 1-3 or 2-3 upshifts). While not a direct fix for a P0755 electrical fault, it shows that shift quality issues can sometimes be software-related.
• The previously cited TSB 21-013-08 was found to apply to newer vehicles with 9-speed transmissions and is not relevant to this Avenger.
• Manufacturer TSB Bulletin #9003769 (dated 2017-11-01) notes that for a DTC of P0755, the manufacturer requested solenoids and harnesses for analysis and recommended repairing the vehicle by replacing the solenoid (PN# 5140429AA) and the transmission harness.
• Manufacturer TSB Bulletin #9003769 (dated 2017-10-25) emphasizes that if a P0755 code is present, technicians should provide freeze frame data for analysis prior to replacing any components.

Platform-Specific Known Issues

• Some owners report that replacing the solenoid pack does not fix the issue. In these cases, the fault often lies with the wiring harness connector or, less commonly, a failed driver in the Powertrain Control Module (PCM). A thread on ScannerDanner Forum details a complex case where a user swapped ECMs and TIPMs trying to chase down intermittent P0760 and P0755 codes, highlighting the diagnostic difficulty.

Mechanic-Grade Diagnostic Values

• 41TE Shift Solenoid Coil Resistance — expected: 0.5 to 9 Ohms, typically 1-3 Ohms between pin 4 (power) and the respective solenoid control pin.. Failure: A reading of infinity (open) or near zero (short) indicates a failed solenoid coil.
• 41TE 2-4 Solenoid (Solenoid 'B') Resistance Test — expected: 0.5 to 9 Ohms between Pin 4 (Power) and Pin 8 (2-4 Solenoid Control) on the solenoid pack connector.. Failure: Resistance outside this range indicates a faulty solenoid pack.
• 62TE Shift Solenoid Coil Resistance — expected: 1.8 Ohms (except Line Pressure Solenoid at 4.9 Ohms).. Failure: Significant deviation from the specified resistance.
• PCM Solenoid Driver Inductive Kick (Oscilloscope) — expected: A sharp voltage spike of approximately 45-50 volts immediately after the PCM de-energizes the solenoid.. Failure: A missing or weak inductive kick suggests a faulty PCM driver circuit, even if the solenoid and wiring test good.

Scan Tool Commands That Help

• Witech or advanced bidirectional scanner: TCM Quick Learn / Transmission Relearn — This procedure is mandatory after replacing the transmission valve body or solenoid pack. It allows the TCM to learn the hydraulic and electrical characteristics of the new components to ensure proper shift timing and feel. Failure to perform this can result in harsh shifting or persistent codes even with good parts.
• Witech or advanced bidirectional scanner: Clear Adaptive Memory / Reset TCM — Can be used to reset learned shift patterns if experiencing unusual shifting behavior. This forces the TCM back to its factory base settings, which can sometimes resolve minor software-related glitches before replacing parts.

Wiring & Ground Locations

• 41TE Solenoid Pack Connector — On the front of the 4-speed transmission, accessible after removing a cover pan.. This 8-pin connector is the primary test point for the solenoid pack. Pin 4 is power, and Pin 8 is the control for the 2-4 solenoid ('B'). Testing resistance here can condemn the solenoid pack without removing it.
• G302 — At the left kick panel area.. This is a major body ground point. While not directly for the transmission, poor grounds in this area can cause a host of bizarre electrical issues for various modules, potentially affecting PCM/TCM operation.
• G300 — On the center floor, to the right of the transmission tunnel.. Another key interior ground point. Verifying major grounds are clean and tight is a crucial step in diagnosing any electronic fault code after direct circuit checks are exhausted.
• s172 (2.4L Engine) — In the engine harness, with a breakout to connector C106, located above the transmission.. This is a factory splice point in the harness. Splices are potential points of failure due to corrosion or vibration, and a fault here could interrupt the signal to the solenoid pack.

Real Owner Repair Stories

• YouTube Channel 'Pine Hollow Auto Diagnostics' (2008 Dodge Avenger) — P0755 code present.
  ❌ Tried (didn't work) Initial assumption was a bad solenoid pack.
  ✅ What actually fixed it The diagnosis pointed to a faulty Powertrain Control Module (PCM). The technician used an oscilloscope to verify the wiring and solenoid coil integrity were good. He observed the PCM's periodic check pulse and the inductive kick from a known-good solenoid circuit compared to the faulty one. The final diagnostic step proposed was to cut and swap the control wires for solenoid 'B' and another solenoid at the PCM to see if the fault code followed the wire or stayed with the PCM driver, definitively proving a bad PCM.
• Reddit user in r/MechanicAdvice (2017 Dodge Grand Caravan with 62TE transmission) — Jerky, clunky shifting, code P0758 (Shift Solenoid 'B')
  ❌ Tried (didn't work) Transmission fluid and filter change., Replacing only the Torque Converter Clutch (TCC) solenoid.
  ✅ What actually fixed it Replacing the entire solenoid pack resolved the P0758 code. However, new codes P0735 (Incorrect Gear Ratio) and P0868 (Low Transmission Pressure) appeared immediately after. The ultimate fix was adding more transmission fluid; the initial refill amount was incorrect. This highlights the critical importance of verifying the correct fluid level after the repair, as low fluid can mimic other failures.

OEM Part Supersession History

• 4504570ac, 5015646ab, 5015646ac → 5140429AA — Redesign and consolidation of the part.
  Heads up: Older 41TE/A604 transmissions used a solenoid pack with a separate steel plate and two gaskets. The new part, 5140429AA, is thicker and designed to be used with only ONE gasket and NO plate. The old plate and second gasket must be discarded during installation.

Model Year Variations Within This Range

• 2008-2010 (primarily): Vehicles equipped with the 4-speed 41TE transmission may have the original-style solenoid pack that included a separate steel plate and two gaskets. Service replacements will use the updated, thicker pack that requires only one gasket.
• 2011-2014 (primarily 3.6L V6): These models are often equipped with the 6-speed 62TE transmission. While it also uses a solenoid pack and can set a P0755, the part is different from the 41TE pack. The 62TE is known to be more sensitive to fluid contamination and valve body wear, which can cause repeat solenoid pack failures.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Faulty Totally Integrated Power Module (TIPM) 🔴 High — Very common across the 2007-2014 model years. Can cause a wide range of random electrical issues. (Ref: No specific recall for Avenger, but it was part of a class-action lawsuit. Symptoms include engine stalling, fuel pump not turning off, horn honking randomly, and starter issues.)
• Front and Rear Subframe Corrosion 🔴 High — Common in salt-belt states. The subframe can rust through, causing popping noises or catastrophic failure of the engine cradle/suspension mounts. (Ref: Chrysler issued a warranty extension (X69) to 10 years for some related vehicles like the Caliber/Compass, but Avenger owners often report having to pay for this repair out-of-pocket.)
• Engine Stalling / Shutting Down 🔴 High — Frequently reported, especially on 2008 models. Can be caused by a faulty throttle body (especially on 2.4L), a bad PCM, or the aforementioned TIPM failure. (Ref: Recall 13V557000 for 2013 models with 2.4L engines for potential engine stall due to balance shaft bearing debris.)
• HVAC Blend Door / Actuator Failure 🟡 Low — Extremely common. Results in clicking/knocking noises from the dashboard or inability to control air temperature/direction (e.g., heat on one side, cold on the other).
• Active Head Restraint (AHR) Random Deployment 🟠 Medium — Affects many Chrysler vehicles of this era. The plastic components inside the headrest can fail, causing it to deploy without a collision. (Ref: Recall 13V282000 for 2011-2013 models to address potential non-deployment, but random deployment is also a known issue.)
• Gear Shifter Stuck in Park 🟠 Medium — A very common complaint for the 2008 model year. Often caused by a failure in the shifter assembly itself, requiring manual override via a pink release tab under the trim.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific P0755 repair, buying a used part is generally not recommended for the solenoid pack itself. However, if diagnosis points to a faulty wiring harness or a Powertrain Control Module (PCM), a used part from a reputable salvage yard can be a cost-effective option, as these are not typically wear-and-tear items.

Donor-vehicle mileage cap: roughly under 100000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a wiring harness: Inspect thoroughly for any cuts, melted sections, or brittle insulation. Ensure all connector tabs are intact.
• For a PCM/TCM: Match part numbers exactly. Check the donor vehicle for signs of flood or fire damage. Ask about the salvage yard's return policy and warranty.
• For a solenoid pack (if you must): Avoid. The risk of receiving a part that is near the end of its life is too high. The labor to install it is significant, making a repeat job very costly.

OEM-only on this vehicle (don't cheap out):

• Transmission Solenoid Pack: While aftermarket options exist, the Mopar (OEM) part is widely considered the most reliable choice to avoid premature failure and compatibility issues. The cost difference is often justified by the labor involved in a potential second replacement.

Aftermarket brands forum-validated for this vehicle:

• Rostra
• ATP

Brands owners have reported issues with on this vehicle:

• Unbranded, no-name parts from online marketplaces are a significant gamble and should be avoided.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0700 — This is a general Transmission Control System (TCS) malfunction code. It is an informational code that is almost always present alongside P0755 to indicate that the Powertrain Control Module (PCM) has stored a specific transmission-related fault.
• P0760 — This code indicates a fault with Shift Solenoid 'C'. It can appear with P0755 in cases of a failed solenoid pack (as it's in the same assembly), widespread wiring issues, or a faulty PCM driver that controls multiple solenoids.
• P0750 — This code points to a fault in Shift Solenoid 'A'. It shares the exact same common causes as P0755: a failed solenoid pack, contaminated ATF+4 fluid, or a wiring harness problem, as all shift solenoids are part of the same system.
• P0765 — This code indicates a fault with Shift Solenoid 'D'. Like other shift solenoid codes, its root cause is often a bad solenoid pack, which houses all the solenoids together, or an electrical issue in the shared control harness.

Frequently Asked Questions