P1775 on 2013 Ram 2500: Solenoid Switch Valve Latched In TCC Position Fixes

What's Unique About the 2013-2013 Ram 2500

The 2013 Ram 2500, typically equipped with the 6.7L Cummins and the 68RFE automatic transmission, has a well-documented history of issues with the valve body and solenoid pack. The Solenoid Switch Valve (SSV) mentioned in the code is a component within this assembly that is prone to wear and sticking due to debris or, more commonly, wear in the valve body bore. This allows the valve to cock sideways and jam. The existence of multiple Technical Service Bulletins (TSBs) from the manufacturer that list P1775 confirms this is a recognized problem for this specific transmission.

Diagnostic Flowchart

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

Symptoms You May Notice 🎬 Watch: A breakdown of common bad transmission shift solenoid symptoms.

• Check Engine Light is on
• Transmission goes into limp mode (stuck in a single gear)
• Harsh or erratic shifting
• Engine stalls or feels like it's going to stall when coming to a stop
• Jerking motion when slowing down to a stop
• Poor acceleration or hesitation
• Inability to shift into higher gears
• A buzzing sound from the transmission area when in Park or Neutral, which can be caused by the main regulator valve operating at maximum line pressure during a limp-in condition

Most Likely Causes

1. Faulty Transmission Solenoid Pack 🔴 High Probability The 68RFE transmission's solenoid pack is a known failure point. The internal valves and bores can wear, causing valves like the SSV to stick. It is a very common failure item.
   How to confirm: A professional technician can use a high-end scan tool to monitor solenoid performance and line pressure. However, given the high failure rate and the presence of code P1775, replacement is the most common diagnostic step after confirming the code and checking wiring.
   Typical fix: Replace the entire solenoid pack assembly. 🎬 See this step-by-step guide on replacing the RFE solenoid block. This part is located inside the transmission, attached to the valve body. After replacement, a transmission 'Quick Learn' procedure is required.
   Est. part cost: $350 - $500
2. Contaminated or Low Transmission Fluid 🟡 Medium Probability As clutches wear, debris contaminates the fluid. This debris can cause fine tolerances within the solenoid pack and valve body to stick or jam. However, this code is more often from mechanical wear than just fluid contamination.
   How to confirm: Check the transmission fluid dipstick. The fluid should be bright red and clear. If it is dark brown/black, smells burnt, or contains visible particles, it is contaminated.
   Typical fix: Perform a complete transmission fluid and filter change. However, if the code is already set, the damage to the solenoid or valve body is likely done, and a fluid change alone will almost certainly not fix it.
   Est. part cost: $100 - $200
3. Worn or Damaged Valve Body ⚪ Low Probability The bore within the valve body where the Solenoid Switch Valve moves can wear out, allowing the valve to cock and stick. This is a well-known issue, and aftermarket companies like Sonnax and RevMax make kits specifically to repair or prevent this wear. 🎬 Watch: How to upgrade your valve body with Sonnax billet parts.
   How to confirm: This requires removing the valve body from the transmission for a physical inspection and vacuum testing, often done by a transmission specialist. They will check for scoring and wear in the valve bores. A worn bore will fail a vacuum test, often pulling less than the required 16 in-Hg.
   Typical fix: Replace the valve body, often with an upgraded unit that includes sleeves for problem areas like the SSV bore. Some specialists ream the bore and install an oversized valve plug kit from a company like Sonnax.
   Est. part cost: $600 - $1300

Rare But Worth Checking

• Wiring Harness Issue: Damage to the wiring harness leading to the transmission can cause erratic signals, though it's less common for this specific 'latched' code than an internal mechanical failure. A diagnostic check for a short in the L/R pressure switch sense circuit is part of the official procedure.
• Faulty Powertrain Control Module (PCM): In very rare cases, the PCM itself can fail, sending incorrect signals. This should only be considered after all other transmission-related possibilities have been exhausted. Some TSBs involve a PCM software flash to adjust diagnostic sensitivity for this code.

Diagnosis Steps

1. Read the code with an OBD-II scanner to confirm P1775 is present.
2. Check for other related transmission codes, especially P1776 and P0841.
3. Check the transmission fluid level and condition. Look for dark, burnt fluid or metallic debris.
4. Inspect the transmission's main electrical connector and wiring harness for any visible damage, corrosion, or loose connections.
5. Using an advanced scan tool (like wiTECH, Snap-On, Autel, or AlfaOBD), monitor transmission line pressure and solenoid command data.
6. If the fluid is dirty, a fluid and filter service is a good starting point, but it is unlikely to resolve the issue.
7. The most common repair is to drop the transmission oil pan and replace the solenoid pack.
8. While the solenoid pack is removed, inspect the valve body for any obvious signs of wear or scoring in the SSV bore. For a definitive diagnosis, perform a vacuum test on the SSV bore; it should hold a minimum of 16 in-Hg.
9. After replacing the solenoid pack or valve body, perform a 'Quick Learn' or 'Relearn' procedure using a compatible scan tool. This is a mandatory step.

Parts You'll Likely Need

• Transmission Solenoid Block/Pack (68RFE) (OEM #68353383AC) — This is the primary cause of P1775. The Solenoid Switch Valve is an integral part of this assembly and is not serviced separately. The 2013 model year originally used a gray connector pack, but the white connector pack (like part 68353383AC, which superseded 68353383AB) is a compatible service replacement.
  Trusted brands: Mopar, RevMax, SunCoast, Rostra
  OEM price range: $375 - $500
  Aftermarket price range: $350 - $450
• Transmission Filter Kit (68RFE) (OEM #68019688AA) — The filters (both spin-on and sump) and pan gasket must be replaced whenever the transmission pan is removed to service the solenoid pack.
  Trusted brands: Mopar, Wix, ATP
  OEM price range: $50 - $80
  Aftermarket price range: $30 - $60
• ATF+4 Automatic Transmission Fluid — The transmission must be refilled with approximately 7-9 quarts of the correct fluid after replacing the solenoid pack. Only ATF+4 should be used.
  Trusted brands: Mopar, Valvoline, Castrol
  OEM price range: $10 - $15 per quart
  Aftermarket price range: $8 - $12 per quart

Related Codes That Often Appear With This One

• P1776 — This code, 'Solenoid Switch Valve Latched In LR Position,' points to the same physical valve sticking in the opposite direction. Seeing both codes strongly indicates a faulty solenoid pack or worn valve body bore.
• P0841 — This code relates to the L/R Pressure Switch Sense Circuit. Diagnostic procedures for P1775 often check for P0841, as they are related to the same hydraulic circuits and are a key part of how the PCM monitors the SSV's position.
• P0871 — This code for 'OD Pressure Switch Rationality' often points to internal hydraulic leaks within the valve body or solenoid pack, specifically at the solenoid switch valve plugs. Owners on forums and in repair videos often report this code alongside P1775, leading to a valve body or solenoid replacement.
• P0933 / P0934 / P0935 — These codes relate to hydraulic line pressure sensor performance. They often appear alongside P1775 in manufacturer TSBs, indicating a systemic pressure control issue within the 68RFE.
• U0100 — This code means 'Lost Communication With ECM/PCM.' It can appear with transmission codes if the fault is severe enough to cause network communication issues.

Technical Service Bulletins (TSBs) & Recalls

• 18-091-16: Lists P1775 as a potential fault code and involves reprogramming the PCM with updated software to change fault detection sensitivity.
• 18-057-15 REV A: Cites P1775 in relation to power train issues.
• 18-030-14 REV. B: Includes P1775 in a list of diagnostic codes for the power train.
• 1803014REVB: Mentions P1775 in a bulletin concerning the hydraulic service brakes, showing how transmission faults can impact other systems.
• 18-030-14 REV. A: An earlier revision of a power train TSB that also lists P1775.

Platform-Specific Known Issues

• Multiple Technical Service Bulletins (TSBs) have been issued by the manufacturer for the 2013 model year Ram 2500 that include the P1775 code, confirming it as a known powertrain and electrical system fault. TSB 18-091-16, for example, involves multiple powertrain codes including P1775.

Mechanic-Grade Diagnostic Values

• Solenoid Coil Resistance — expected: Approximately 1.3 Ohms for most solenoids (L/R, MS, UD, OD, 4C, 2C). Approximately 3.5 - 4.9 Ohms for the Pressure Control solenoid.. Failure: A reading of open circuit (infinite resistance) or a significant deviation from the expected value indicates a failed solenoid coil.
• L/R Solenoid Circuit Resistance (at TCM connector) — expected: Approximately 1.8 Ohms. Failure: An open circuit reading suggests a break in the wiring or a failed solenoid coil. A lower reading could indicate a short.
• Solenoid Switch Valve (SSV) Bore Vacuum Test — expected: Minimum 16 in-Hg, with 20+ in-Hg being ideal.. Failure: A reading below 16 in-Hg (e.g., 12 in-Hg) indicates excessive wear in the valve body bore, which will cause the valve to stick even if the solenoid pack is new.
• Line Pressure Sensor Voltage — expected: Between 0.35V and 4.75V.. Failure: Voltage less than 0.35V may set a P0934 (Circuit Low) code. Voltage over 4.75V may set a P0935 (Circuit High) code.

Scan Tool Commands That Help

• Miller Tool #8333 (Transmission Simulator): Pressure Switch Selector Switch — Used in official diagnostic procedures to manually test the L/R pressure switch circuit independently from the transmission's hydraulics, isolating the electrical circuit for faults.
• wiTECH, Autel, Snap-On, AlfaOBD: Transmission Quick Learn — This is a mandatory procedure after replacing the solenoid pack or valve body to reset transmission adaptive values and ensure proper shifting.

Wiring & Ground Locations

• Transmission Solenoid/TRS Assembly Connector (23-pin) — On the driver's side of the 68RFE transmission case.. This is the main electrical interface for the solenoid pack. P1775 is related to the L/R solenoid and its monitoring circuit, the L/R pressure switch.
• Pin 2 (L/R Solenoid Control) — In the 23-pin transmission connector.. This pin carries the signal from the TCM to energize the Low/Reverse solenoid, which actuates the Solenoid Switch Valve.
• Pin 14 (L/R Pressure Switch Sense) — In the 23-pin transmission connector.. The TCM monitors this circuit to confirm the Solenoid Switch Valve has moved. A fault on this circuit can cause or be related to P1775.
• Pin 10 (Transmission Control Relay Output) — In the 23-pin transmission connector.. This is the power feed for the solenoid pack. Testing resistance between Pin 2 and Pin 10 checks the integrity of the L/R solenoid coil.

Real Owner Repair Stories

• Turbo Diesel Register forum user 'transe' (2008 Ram 2500 6.7L 4x4 (with 68RFE)) — Goes straight to limp mode (4th gear), buzzing sound in Park and Neutral, throwing code P0750 (LR Solenoid Circuit fault).
  ❌ Tried (didn't work) Replaced valve body and rebuilt original solenoid pack., Replaced the rebuilt solenoid pack with a brand new one.
  ✅ What actually fixed it The final fix was not posted, but a master technician provided advanced diagnostic steps: Check the resistance of the entire L/R solenoid circuit from the TCM connector (C4). The expected resistance between the pin for trans connector Pin 2 and the pin for trans connector Pin 10 should be ~1.8 ohms. This isolates the problem to either the wiring harness or the new solenoid pack itself, proving that just replacing parts isn't always the solution.

OEM Part Supersession History

• Black Connector Solenoid Pack → White Connector Solenoid Pack — The original black connector packs used from 1999-2003 had reliability issues. The white connector pack was an updated, more reliable design.
  Heads up: To use a white connector pack on a pre-2004 vehicle, the TRS cam plate must also be changed.
• White Connector Solenoid Pack (6-solenoid) → Gray Connector Solenoid Pack (5-solenoid) — In 2010/2011, Chrysler determined the overdrive solenoid was not needed and eliminated it, along with two check balls in the valve body.
  Heads up: A 2013 Ram 2500 would have a gray connector pack from the factory. However, the white connector pack is backward compatible and can be used as a service replacement. The gray connector pack cannot be used on pre-2011 models that require all six solenoids.

Model Year Variations Within This Range

• 2013: The 2013 model year falls into the generation (2011-2018) that used the gray, 5-solenoid connector pack from the factory. However, service replacements often use the earlier white, 6-solenoid pack, which is compatible. This is important to know when sourcing parts to avoid confusion.