P2706 on 2018-2020 Ram 2500: MS Solenoid Circuit Fault Causes and Fixes

What's Unique About the 2018-2020 Ram 2500

The 68RFE transmission, used in Ram HD trucks since 2007, has a well-documented history of solenoid pack failures, making P2706 a common code. For the 2018-2020 model years, this remains the most common point of failure. A key difference within this year range is the solenoid pack itself: 2018 models use a pack with a grey or white connector (P/N 68376695AA or superseded 68353383AB), while 2019-2020 models use an updated pack with a blue connector (P/N 68456067AA) that is not interchangeable. Furthermore, 2019 and newer models require the new solenoid's unique 46-character flow rate code to be scanned and programmed into the TCM 🎬 Watch: How to program the new 46-character flow rate code. using a capable scan tool, adding a layer of complexity to the repair.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: The 2018 model year is the last of the fourth-generation Ram HD, while 2019-2020 models are the beginning of the fifth generation. Both use the 68RFE transmission, but with different solenoid packs. 2018 models use a grey/white connector pack (e.g., Mopar P/N 68376695AA), while 2019-2020 models use a blue connector pack (Mopar P/N 68456067AA) that requires programming.

Symptoms You May Notice

• Check Engine Light is on
• Harsh, erratic, or delayed gear shifts
• Transmission stuck in one gear (limp mode), often 3rd or 4th gear
• Vehicle may not move from a stop, or has a delayed engagement into Drive
• Transmission overheating warning light
• Loud buzzing sound from the transmission area in Park or Neutral
• Decreased fuel economy

Most Likely Causes

1. Failed Transmission Solenoid Pack 🔴 High Probability The 68RFE solenoid pack is a widely recognized weak point. The internal electronics and circuit board are susceptible to failure from heat, vibration, and fluid contamination over time. Aftermarket transmission builders confirm this is one of the most common failure items.
   How to confirm: A technician can use a scan tool to command the MS solenoid and monitor its response. A more definitive test is to measure the resistance of the MS solenoid circuit at the main transmission connector (Pin 21 to ground). The expected resistance is approximately 1.3 Ohms. An open circuit (infinite resistance) or short (near zero) confirms a faulty solenoid pack.
   Typical fix: Replace the entire transmission solenoid pack assembly. This involves draining the fluid, dropping the transmission pan, unbolting the old solenoid pack from the valve body, and installing the new one. The transmission filters and fluid should also be replaced. For 2019+ models, the new solenoid's QR code must be scanned and programmed into the TCM, followed by a 'Quick Learn' procedure for all years.
   Est. part cost: $350-$700
2. Damaged Wiring or Connector ⚪ Low Probability The main transmission harness connector is exposed to moisture and road debris, potentially causing corrosion or damage to the pins. The harness can also chafe against the chassis or engine components.
   How to confirm: Visually inspect the round transmission connector for corrosion, bent pins, or damage, paying close attention to Pin 21. Perform a continuity test on the MS solenoid control circuit wire (T140) between the TCM and the transmission connector to check for opens or shorts to ground/power. Resistance should be less than 5.0 Ohms for the wire itself, and greater than 5.0 Ohms when checking for a short to ground.
   Typical fix: Repair the damaged section of the wiring harness or clean/replace the connector pins. A harness pigtail may be needed for severe corrosion.
   Est. part cost: $20-$200
3. Outdated PCM Software ⚪ Low Probability TSB #18-061-20 REV. A was issued for 2018 models specifically because a software glitch could incorrectly trigger the P2706 code, often along with other unrelated codes. The fix is a PCM reflash. Other TSBs for 2019-2020 models also list P2706 among many other codes fixed by software updates, suggesting a broader potential for software-induced faults.
   How to confirm: A dealership or qualified shop using a wiTECH scan tool can check the vehicle's current software calibration number against the latest available from the manufacturer as specified in the TSB.
   Typical fix: Reprogram the Powertrain Control Module (PCM) with the latest software update. The TSB also specifies that a transmission 'Quicklearn' procedure must be performed after the flash.
   Est. part cost: $0-$200

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is very uncommon, but if the solenoid pack and wiring are confirmed to be good and software is up to date, the driver circuit inside the PCM could be the source of the fault. This should be the last item to consider after all other possibilities are exhausted.

Diagnosis Steps

1. Check and verify the transmission fluid level and condition. Fluid should be at the correct level and not appear burnt or contain excessive debris.
2. For 2018 models, check with a dealer for the applicability of TSB #18-061-20 REV. A, which may resolve the code with a PCM software update.
3. Scan for any other accompanying fault codes. Multiple unrelated codes may point towards a software issue or a wiring problem.
4. Inspect the main transmission wiring harness and the large round connector at the transmission case for any visible damage, corrosion, or loose pins, especially Pin 21.
5. Using a multimeter, test the resistance of the MS solenoid circuit. Disconnect the transmission connector and measure between Pin 21 and a good ground. A reading far from the specification of ~1.3 Ohms indicates a faulty solenoid pack.
6. If resistance is within spec, test the T140 (MS Solenoid Control) wire for a short to ground or a short to power between the PCM and the transmission connector.
7. If wiring and the solenoid pack test good, and software is up-to-date, the fault may lie within the PCM, but this is rare and requires advanced diagnostics.

Parts You'll Likely Need

• Transmission Solenoid Pack (68RFE, 2011-2018) (OEM #68376695AB (supersedes 68353383AB, 68376696AA)) — For 2018 models, this grey/white connector pack is the most common failure point for P2706. The MS solenoid is integrated and not serviced separately.
  Trusted brands: Mopar, SunCoast, Revmax, Dorman
  OEM price range: $370-$550
  Aftermarket price range: $350-$600
• Transmission Solenoid Pack (68RFE, 2019-2020) (OEM #68456067AA) — For 2019-2020 models, this blue connector pack is required. It is not interchangeable with the earlier grey/white style and requires programming.
  Trusted brands: Mopar, ATS Diesel, SunCoast
  OEM price range: $400-$600
  Aftermarket price range: $400-$600
• Transmission Filter Kit and Fluid — The two transmission filters (sump and spin-on) and fluid (Mopar ATF+4) must be replaced whenever the transmission pan is removed for service.
  Trusted brands: Mopar
  OEM price range: $80-$150
  Aftermarket price range: $50-$100

Related Codes That Often Appear With This One

• P0700 — This is a generic code indicating the Transmission Control Module (TCM) has stored a fault. It serves as a 'check engine light' request from the transmission and will almost always accompany a specific transmission code like P2706.
• P0871 — This code for Overdrive Pressure Switch Rationality can appear with P2706. Since the pressure switches are part of the same solenoid/sensor block assembly, an electrical failure in one area can trigger rationality codes in another. A worn Solenoid Switch Valve (SSV) bore in the valve body is a known cause for P0871.
• P0868 — This code for 'Line Pressure Low' is often seen with P2706. A faulty MS solenoid can disrupt hydraulic control, leading to incorrect line pressure. TSB #18-061-20 REV. A also lists this code alongside P2706 as being potentially resolved by a PCM flash for 2018 models.

Technical Service Bulletins (TSBs) & Recalls

• 18-061-20 REV. A: For 2018 models, explicitly lists P2706 as a code that can be fixed by reprogramming the PCM.
• 1810222REVA: Lists P2706-00 on 2020 models with many other DTCs, fixed by a software update.
• 1806623: Lists P2706-00 on 2019 models with many other DTCs, fixed by a software update.
• 1810122REVA: Lists P2706-00 on 2019 models with many other DTCs, fixed by a software update.
• 18-101-22: Lists P2706-00 on 2019 models with other DTCs, fixed by a software update.

Platform-Specific Known Issues

• TSB #18-061-20 REV. A specifically addresses P2706 on 2018 models, where a PCM software update may be the sole required fix.

Mechanic-Grade Diagnostic Values

• MS (Multi-Select) Solenoid Coil Resistance — expected: 1.3 Ohms. Failure: A reading significantly higher or lower, or an open circuit (infinite resistance), confirms a failed solenoid coil.
• MS Solenoid Control Circuit (T140) Continuity — expected: Less than 5.0 Ohms. Failure: Resistance above 5.0 Ohms when measured from the PCM connector to the transmission harness connector indicates an open or high-resistance wire.
• MS Solenoid Control Circuit (T140) Short to Ground — expected: Infinite resistance (Open Line / OL). Failure: A resistance reading below 5.0 Ohms indicates a short to ground in the wiring harness.
• Pressure Control (PC) Solenoid Resistance — expected: 4.9 Ohms. Failure: While not a direct cause of P2706, a reading far from 4.9 Ohms on its respective pin indicates a bad PC solenoid within the same pack.

Scan Tool Commands That Help

• wiTECH, Autel, Snap-On: Solenoid Actuation Test — During diagnosis, a technician can command the MS solenoid on and off to verify its electrical function. This test can be monitored with a special tool (Transmission Simulator 8333A) or by listening for a click, confirming if the solenoid is receiving the command from the TCM.
• wiTECH, Autel, Snap-On, AlphaOBD: Quick Learn — This procedure is mandatory after replacing the solenoid pack or valve body. It resets and recalibrates transmission shift adapts and clutch volume indexes (CVIs). Failure to perform this can lead to harsh shifting and premature wear.
• wiTECH or equivalent OEM-level tool: Solenoid Characterization / QR Code Programming — For 2019 and newer models with the blue connector solenoid pack, the unique 46-character code from the new solenoid's QR code must be scanned and programmed into the TCM. This calibrates the TCM to the specific flow characteristics of the new part.

Wiring & Ground Locations

• Transmission Connector (C106/C107) — The large, round electrical connector on the driver's side of the 68RFE transmission case, above the pan rail.. This is the primary access point for all electrical testing of the transmission's internal components. Pin 21 is the specific terminal for the MS Solenoid control circuit (T140) and is the main focus for resistance and voltage tests for P2706.
• Circuit T140 — The wire running from the Powertrain Control Module (PCM/TCM) to Pin 21 of the main transmission connector.. This is the specific wire that controls the MS solenoid. Diagnostic procedures involve testing this wire for continuity (no breaks) and for shorts to ground or other power sources along its length.
• Ground G910A — Located on the left side of the engine block, near the transmission.. A poor ground connection at this point can cause a variety of electrical issues for the transmission and engine controls, potentially leading to erratic behavior or incorrect fault codes. While not a direct cause of an open circuit code like P2706, verifying a clean, tight ground here is a crucial step in any electrical diagnosis.

Real Owner Repair Stories

• Auto Guy Diy on YouTube (2009 Ram 1500 (545RFE, similar architecture)) — Truck suddenly got stuck in 4th gear (limp mode). After a restart, it would drive but had long, delayed shifts. Scan tool showed code P2706.
  ❌ Tried (didn't work) The owner immediately suspected the solenoid based on the code.
  ✅ What actually fixed it The owner replaced the transmission solenoid pack, along with the transmission filters and gasket. After the replacement and refilling the fluid, the check engine light was gone and the truck shifted normally.
• Turbo Diesel Register forum user (2008 Ram 2500 6.7L with 68RFE) — Truck went into limp mode (4th gear only) and made a loud buzzing sound in Park and Neutral. Code P0750 (LR Solenoid Circuit) was present, which is an analogous electrical fault to P2706.
  ❌ Tried (didn't work) Rebuilt the original solenoid pack., Replaced the valve body.
  ✅ What actually fixed it The final fix was replacing the entire solenoid pack with a brand new unit. The buzzing sound was identified as the main regulator valve operating at maximum, uncontrolled line pressure due to the limp mode condition, and it resolved itself once the electrical fault was fixed.

OEM Part Supersession History

• 68367309AA, 68456067AA → 68456067AB — Internal revisions and updates by the manufacturer for improved reliability or performance.
  Heads up: This blue connector solenoid pack (68456067AA/AB) is ONLY for 2019+ models and is not backward compatible with 2018 or older transmissions that use the grey/white connector pack.

Model Year Variations Within This Range

• 2019-2020: These models use the blue connector solenoid pack (P/N 68456067AA or later) which requires programming. The TCM must be updated with a 46-character code generated from the QR code on the new solenoid to calibrate for its specific hydraulic flow rates.
• 2018: This model year uses the grey or white connector solenoid pack (P/N 68376695AB or similar) which does not require QR code programming. It is also the subject of TSB #18-061-20 REV. A, which can resolve P2706 with only a PCM software update.