P2757 on 2016-2017 Ram 3500: TCC Solenoid Circuit Performance Guide

What's Unique About the 2016-2017 Ram 3500

For the 2016-2017 Ram 3500, particularly those equipped with the heavy-duty Aisin AS69RC transmission, this code is directly addressed by manufacturer Technical Service Bulletins (TSBs). Unlike many vehicles where this code might first suggest an external wiring problem, Ram has specifically identified internal transmission and torque converter failures as the root cause for a range of vehicles, making it a more serious issue from the outset. The AS69RC is a robust commercial-duty transmission, but it is known to have specific weak points in the torque converter, valve body, and certain clutch hubs.

Diagnostic Flowchart

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

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp) is on.
• Transmission shudder or vibration, especially during acceleration between 2,000-3,500 rpm.
• Delayed or harsh gear shifts.
• Engine RPM is higher than usual at highway speeds, as the torque converter fails to lock.
• Noticeable loss of power or a feeling of 'slipping' under load.
• Reduced fuel economy.
• Transmission may overheat, potentially triggering a warning light.

Most Likely Causes

1. Faulty Torque Converter 🔴 High Probability A specific TSB (#21-027-16 REV. A) for 2016 models with the AS69RC transmission identifies a dislodged internal snap ring in the torque converter as the direct cause for the P2757 code. This applies to a specific build range, but stock AS69RC torque converters are also known to be a general weak point.
   How to confirm: A technician must follow the diagnostic procedure outlined in the TSB, which involves confirming the DTC and the vehicle's build date (March 29, 2016 - April 11, 2016). The ultimate confirmation is removing the transmission to inspect and replace the torque converter.
   Typical fix: Replace the torque converter with the updated part specified in the TSB. The labor for this repair is estimated at 3.4 hours, plus additional time for 4x4 models.
   Est. part cost: $600-$1800
2. Faulty TCC Pressure Control Solenoid / Valve Body 🔴 High Probability The TCC solenoid is a common failure point. In the AS69RC transmission, solenoids are often replaced as part of the entire valve body assembly, as individual solenoids are not typically sold by dealers. Debris in the fluid can cause the solenoid or valves in the body to stick, and the valve body itself is a known failure point.
   How to confirm: A technician can use a high-end scan tool to command the TCC solenoid on and off while monitoring transmission data. Electrical tests on the solenoid's circuit can also be performed. Inspecting the valve body requires removing the transmission pan. A forum user on Turbo Diesel Register noted that a dealer tech had seen this issue on 7-8 trucks, pointing to the valve body.
   Typical fix: Replace the faulty solenoid or, more commonly, the entire valve body assembly. Aftermarket companies like Sonnax offer upgraded components for these valve bodies.
   Est. part cost: $1000-$1600 for an OEM Mopar valve body assembly, plus a core charge of around $300-$500.
3. Low or Contaminated Transmission Fluid 🟡 Medium Probability While the code points to a performance fault, low fluid levels can cause pressure issues that prevent the TCC from engaging properly. Contaminated fluid, especially with debris from internal wear, can cause solenoids and valves to stick. The AS69RC requires a specific Mopar ASRC fluid.
   How to confirm: Check the transmission fluid level and condition according to the manufacturer's procedure. The fluid should be red and clear, not brown, black, or smelling burnt. Check for metal particles.
   Typical fix: Perform a transmission fluid and filter change using the correct Mopar ASRC specification fluid. This is often the first step before more expensive repairs.
   Est. part cost: $150-$300
4. Wiring or Connector Issue ⚪ Low Probability Though less common than internal failures on this platform, corrosion or damage to the transmission wiring harness or connectors can still interrupt the signal to the TCC solenoid. One forum member on Turbo Diesel Register suggested checking the large connector under the cab near the driver's left foot for corrosion or pushed-out pins as a first electrical check.
   How to confirm: Visually inspect the main transmission harness connector for damage, corrosion, or pushed-out pins. Perform a continuity and resistance test on the TCC solenoid circuit from the TCM to the transmission.
   Typical fix: Repair the damaged wiring or clean/replace the affected connector.
   Est. part cost: $20-$200

Rare But Worth Checking

• Faulty Transmission Control Module (TCM): A TCM failure is rare, but it can cause a P2757 code if the internal driver circuit for the TCC solenoid fails. This should only be considered after all other possibilities, especially the TSB-related repairs, have been exhausted.

Diagnosis Steps

1. Check for and review any Technical Service Bulletins (TSBs) for your vehicle's VIN. For 2016 models, TSB 21-027-16 REV. A is a critical first step. This TSB applies to vehicles built between March 29, 2016, and April 11, 2016.
2. Using a professional scan tool (like wiTECH for dealers), verify that P2757 is the primary code and check for any other transmission or engine-related codes.
3. Check the transmission fluid level and condition. Ensure the fluid is clean, at the correct level, and does not smell burnt. Use only Mopar ASRC specification fluid.
4. Inspect the transmission wiring harness and connectors for any visible signs of damage, corrosion, or loose connections, paying attention to the main connector under the driver's side of the cab.
5. With a scan tool, monitor live data for engine RPM and transmission input/output speeds to confirm the torque converter is slipping when lock-up is commanded.
6. If TSBs and fluid checks do not resolve the issue, the next step is to drop the transmission pan to inspect the valve body, solenoids, and internal harness.
7. If the vehicle falls under the TSB for the torque converter, the transmission must be removed to replace the torque converter.

Parts You'll Likely Need

• Torque Converter Kit (OEM #RL335702AA) — A known defect involving a dislodged snap ring causes this code on some 2016 models, as per TSB 21-027-16. Aftermarket performance converters are also a popular upgrade to address OEM weaknesses.
  Trusted brands: Mopar, Randy's Transmissions, ATS Diesel Performance, Revmax
  OEM price range: $700-$1200
  Aftermarket price range: $600-$1500
• Transmission Valve Body Assembly (OEM #68445748AA) — The TCC solenoid is integrated into the valve body. A faulty solenoid or worn valve bore often requires replacing the entire assembly. This part fits 2013-2018 Ram 3500 models with the AS69RC.
  Trusted brands: Mopar, Aisin, Sonnax (for rebuilt units), Randy's Transmissions
  OEM price range: $1100-$1600
  Aftermarket price range: $800-$1300
• Mopar ASRC Automatic Transmission Fluid (OEM #05189966AB) — The correct fluid is required for any repair involving opening the transmission, such as a filter change or valve body replacement. The AS69RC is sensitive to fluid type.
  Trusted brands: Mopar
  OEM price range: $20-$30 per quart

Technical Service Bulletins (TSBs) & Recalls

• 21-027-16 REV. A: Supersedes the previous version and involves r

Platform-Specific Known Issues

• TSB #21-027-16 REV. A: For some 2016 Ram 3500/4500/5500 models with the 6.7L Cummins and AS69RC transmission, built between March 29, 2016, and April 11, 2016, this code is caused by a dislodged snap ring inside the torque converter. The official repair is to replace the torque converter.
• TSB #RL300150A$: For 2016 models (DD, DF, DP) with the AS69RC transmission, this TSB also references code P2757 and lists specific transmission assembly part numbers for replacement, indicating the fault may require a complete transmission replacement in some cases.

Mechanic-Grade Diagnostic Values

• Resistance of TCC/Lockup Solenoid (SLU) — expected: 4-6 Ohms. Failure: A reading outside this range (open circuit or short) indicates a failed solenoid coil.
• Resistance of other AS69RC solenoids — expected: Small yellow connector (PWM): 4-6 ohms. Large black connector (PWM): 4-6 ohms. Green connector (On/Off type): 11-21 ohms.. Failure: An incorrect resistance value points to a specific solenoid failure within the valve body.
• TCM Solenoid Power Supply Voltage — expected: Battery/System Voltage (approx. 12.6V - 14.4V) with key on, engine running.. Failure: Voltage below this threshold (e.g., under 10V) can trigger a circuit performance code.

Hidden / Shadow Codes Worth Checking

• P2757-00: The '-00' is a standard Failure Type Byte (FTB) indicating a general 'Performance' or 'Stuck Off' fault. It is not a hidden code but is displayed by professional scan tools like wiTECH and provides more specific context than the base P-code alone. (see via Professional scan tools like Mopar's wiTECH.)

Scan Tool Commands That Help

• wiTECH or equivalent professional scan tool: TCC Solenoid Actuator Test / Bi-directional Control — To command the TCC solenoid on and off while the vehicle is static or during a road test. This helps verify if the solenoid is mechanically stuck or if the hydraulic circuit is responding to electrical commands.
• wiTECH or equivalent professional scan tool: Reset Transmission Adaptives / Quick Learn — This is a mandatory step after replacing the valve body or entire transmission. It clears the learned shift parameters and forces the TCM to relearn the clutch fill times and pressure characteristics of the new components to ensure proper shift quality.

Wiring & Ground Locations

• TCC/SLU Solenoid Wire — Inside the transmission, part of the internal wiring harness connecting the valve body to the main case connector.. The wire for the lock-up solenoid (SLU) is Blue/Gray. Knowing the specific wire color is critical for performing targeted continuity or voltage drop tests on the correct circuit without having to guess.
• Transmission Case Ground — A braided ground strap typically connects the transmission case to the vehicle's chassis or frame, often near a transmission mount.. While not a direct cause of P2757, a poor transmission ground can cause erratic behavior from all electronic components, including solenoids and sensors. It can introduce electrical noise and unstable voltage references, potentially leading to incorrect diagnoses.

Real Owner Repair Stories

• Turbo Diesel Register user 'Signal73' (Ram with AS69RC transmission) — P2757 code present.
  ✅ What actually fixed it The user discovered a catastrophic failure: the 'Torque converter swelled up and pushed the flywheel into the flexplate/bellhousing adapter.' The converter was physically stuck on the transmission input shaft, requiring replacement of the torque converter.
• Turbo Diesel Register user 'Busboy' (Ram with AS69RC transmission) — P0974 - Shift Solenoid 'A' Control Circuit High (a related electrical code)
  ❌ Tried (didn't work) Replacing the Bully Dog tuner., Testing all 7 solenoids for resistance and shorts to ground (all tested okay)., Tracing internal transmission wiring (all checked out).
  ✅ What actually fixed it The user concluded the issue was the Transmission Control Module (TCM) itself, as all other electrical components in the circuit tested good. This highlights a real-world diagnostic path where individual components check out, pointing towards the controlling module.

OEM Part Supersession History

• TSB 21-027-16 → TSB 21-027-16 REV. A — The revised bulletin streamlined the diagnostic process. It removed some diagnostic steps and added a note emphasizing that if a vehicle's VIN is on the Rapid Response Transmittal (RRT) list for this issue, the repair (torque converter replacement) should be performed without extensive diagnosis.

Model Year Variations Within This Range

• 2016 (Specifically builds from March 29, 2016 - April 11, 2016): Vehicles within this specific build window are subject to TSB #21-027-16 REV. A, which identifies the root cause of P2757 as a dislodged snap ring inside the torque converter. For these specific trucks, the torque converter is the primary suspect, not the valve body or wiring.
• 2013-2018 vs 2019-Later: Aftermarket valve body manufacturer Sonnax lists two different part numbers for their remanufactured AS69RC valve bodies: one for 2013-2018 models and another for 2019 and later models. This indicates a design change in the valve body assembly starting in the 2019 model year, and parts are likely not interchangeable across this boundary.