U0402 on 2015-2017 Chrysler 200: Implausible TCM Data Causes and Fixes

What's Unique About the 2015-2017 Chrysler 200

The 2015-2017 Chrysler 200 uses a ZF-designed 9-speed automatic transmission (model 948TE) which was known for having significant software and hardware issues in its early years. Chrysler released numerous software updates (flashes) to fix problems like harsh shifting, poor performance, and communication errors like U0402. The existence of a Technical Service Bulletin (TSB #9003785) instructing technicians to call a specific engineer before working on U0402 issues highlights how sensitive and specific the diagnostic process can be for this particular vehicle, often pointing towards a software update rather than a simple part replacement. TSBs like 21-013-16 and W84 also address reprogramming the TCM and PCM to resolve these issues.

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 is on
• Transmission warning light may be illuminated
• Vehicle enters 'limp mode' (stuck in a single gear)
• Harsh, erratic, or delayed shifting
• Difficulty or delay when shifting out of Park
• Vehicle may stall
• Flashing traction control light
• Service Transmission message on the instrument cluster

Most Likely Causes

1. Outdated or Corrupt Transmission Control Module (TCM) Software 🔴 High Probability The 948TE transmission in this platform had many running software changes to improve performance and fix bugs. Numerous TSBs (e.g., 21-013-16, 18-022-17 REV. A) explicitly call for software updates to fix this and related codes.
   How to confirm: A dealership or a qualified shop with a wiTECH scan tool can check the current software calibration level of the TCM and PCM and compare it against the latest available version from Chrysler.
   Typical fix: Reprogramming (flashing) the TCM and possibly the PCM to the latest software version. This must be done by a dealer or a shop with the correct equipment and a stable power supply during the flash. 🎬 See how a professional technician reflashes a Chrysler control module A Reddit user confirmed a dealer flash fixed their shifting issues.
   Est. part cost: $0
2. Wiring Harness or Connector Issues 🟡 Medium Probability Wiring for the TCM can be exposed to engine bay heat and vibrations, leading to chafed wires, loose connections, or corrosion at the connectors over time. A YouTube video highlights several potential chafe points in the Chrysler 200 engine bay harness, such as where it can rub on hose clamps. 🎬 Watch: Common wiring harness chafe points on the Chrysler 200
   How to confirm: Visually inspect the wiring harness going to the TCM and transmission for any signs of damage, melting, or corrosion. Pay close attention to areas where the harness may rub against other components. A multimeter can be used to check for continuity and proper voltage on the CAN bus wires.
   Typical fix: Repairing the damaged section of the wiring harness or cleaning/replacing the affected connectors. This can involve soldering, heat-shrinking, and re-looming the harness.
   Est. part cost: $10-$50
3. Low Battery Voltage or Charging System Fault 🟡 Medium Probability Modern control modules are sensitive to voltage. A weak battery or failing alternator can cause communication glitches between modules, triggering a U0402 code. This is a common point of failure on many modern cars, not just the Chrysler 200.
   How to confirm: Test the battery and charging system. A healthy system should show approximately 12.6 volts with the engine off and 13.5-14.5 volts with the engine running. Many TSBs for software flashing specifically require connecting a battery charger to maintain stable voltage above 13.2V during the procedure.
   Typical fix: Replace the battery or repair the charging system (e.g., replace the alternator).
   Est. part cost: $150-$500
4. Failing Transmission Control Module (TCM) ⚪ Low Probability While less common than software issues, internal hardware failure of the TCM can cause it to send corrupted data. The TCM is mounted directly to the transmission, exposing it to heat and vibration that can lead to eventual failure.
   How to confirm: This is usually diagnosed by exclusion. If the software is up-to-date and all wiring, grounds, and power/ground connections are confirmed to be good, the module itself is the likely culprit.
   Typical fix: Replacing the TCM. The new module will need to be programmed to the vehicle's VIN using a tool like wiTECH.
   Est. part cost: $300-$850

Rare But Worth Checking

• Failing Powertrain Control Module (PCM): It's possible for the receiving module (PCM) to be the source of the fault, but it's much less common than issues with the sending module (TCM).
• Internal Transmission Failure: A severe mechanical failure within the transmission could potentially cause sensors to generate data that the TCM then misinterprets and sends to the PCM, but other, more specific transmission codes would likely be present.
• Faulty Transmission Valve Body: A malfunctioning valve body can cause erratic hydraulic pressure and shifting, which could lead to the TCM sending implausible data. However, this would typically be accompanied by other specific transmission performance codes.

Diagnosis Steps

1. Check for TSBs: Use the vehicle's VIN to check for any open recalls or Technical Service Bulletins related to the transmission or PCM. Many issues on this platform are solved with software updates.
2. Scan for All Codes: Use a quality OBD-II scanner capable of reading manufacturer-specific codes from all vehicle modules, not just the engine computer. Note any other codes present as they can provide critical clues.
3. Check Battery and Charging System: Ensure the battery is fully charged and the alternator is functioning correctly. Low or fluctuating voltage is a known cause of module communication errors. Voltage should be ~12.6V (engine off) and 13.5-14.5V (engine running).
4. Inspect Wiring: Carefully inspect the wiring harness and connectors between the PCM and the TCM for any signs of chafing, melting, corrosion, or loose pins. A known chafe point is where the main engine harness can rub on hose clamps or other components.
5. Verify Software Version: This is a critical step. Have a dealer or qualified shop with a wiTECH scan tool check if the TCM and PCM software is up-to-date. This is the most common fix.
6. Check Transmission Fluid Level & Condition: While not a direct cause of a communication code, low or burnt fluid can cause erratic shifting that might be a contributing factor. The level must be checked using a specific procedure as there is no dipstick.
🎬 Watch: How to change fluid on the 948TE 9-speed transmission
7. Advanced Diagnostics: If the above steps do not resolve the issue, a technician may need to perform advanced network diagnostics, such as checking CAN bus resistance (should be ~60 Ohms with the battery disconnected) and checking for proper ground connections before condemning a control module.

Parts You'll Likely Need

• Transmission Control Module (TCM) (OEM #68294441AA, 68441896AA, 68467808AA (Part number is VIN-specific, verify with dealer)) — If software and wiring are ruled out, the module itself may have failed internally. A replacement is the only fix.
  Trusted brands: Mopar
  OEM price range: $480-$850
  Aftermarket price range: $250-$500

Related Codes That Often Appear With This One

• U0100 — Indicates a broader loss of communication with the PCM/ECM, suggesting a more widespread network problem rather than just implausible data.
• U1424 — This code for 'Implausible Engine Torque Signal Received' often appears with U0402 in Chrysler TSBs, indicating a conflict in data between the engine and transmission modules.
• P0116 — Listed alongside U0402 in TSB #18-007-15 REV. B for the related Jeep Cherokee, suggesting a PCM software issue can trigger multiple, seemingly unrelated codes.
• P0441 — Listed alongside U0402 in TSB #18-007-15 REV. B, pointing to a common PCM software fault affecting multiple systems.
• P0480 — Listed alongside U0402 in multiple TSBs (#1805116, #18-022-17 REV. A, #18-052-16 REV. A), pointing to a common software or electrical fault.

Technical Service Bulletins (TSBs) & Recalls

• 9003785: Instructs technicians to call a specific engineer for guidance when encountering U0402 on a vehicle with a transmission concern.
• 1805116: Lists U0402 as one of several potential DTCs related to an electrical system issue.
• 18-022-17 REV. A: Lists U0402 as a possible code set due to a condition requiring a PCM software update.
• 18-052-16 REV. A: Includes U0402 in a list of DTCs that may set related to engine and engine cooling systems.
• 21-013-16 REV. A: Provides a 'Quick Learn Procedure' for the 948TE transmission to address erratic shift quality, applicable to the Chrysler 200.
• 18-007-15 REV. B: While for a Jeep Cherokee, it shows that a PCM software update can fix a cluster of codes including U0402, P0441, and P0116, demonstrating how software is a common root cause.
• W84: A customer satisfaction campaign that includes PCM/TCM software updates and provides specific instructions on how to proceed if code U0402 is found.

Platform-Specific Known Issues

• Numerous TSBs exist for the 2015-2017 Chrysler 200 to update the TCM and/or PCM software to correct shifting issues and false diagnostic codes. TSB 21-013-16 specifically outlines a 'Quick Learn Procedure' for the 948TE transmission.
• TSB #9003785 specifically mentions U0402 and instructs technicians to call a specific engineer before working on transmission concerns, indicating the complexity of the issue on this platform.

Mechanic-Grade Diagnostic Values

• CAN Bus Network Resistance — expected: ~60 Ω. Failure: A reading of ~120 Ω indicates an open circuit in one of the terminating modules/resistors. A reading near 0 Ω indicates a short between the CAN High and CAN Low wires.
• CAN Bus Voltage (Multimeter) — expected: CAN High (Pin 6): ~2.6V, CAN Low (Pin 14): ~2.4V. Failure: Significant deviation from these voltages, or a reading near 0V on both, indicates a network fault like a short to ground.
• TCM Power Supply Voltage — expected: 11.5V - 13.5V. Failure: Voltage below 11.5V can cause modules to behave erratically and set communication codes.

Scan Tool Commands That Help

• wiTECH, Autel, or equivalent bidirectional scanner: TCM Quick Learn — This procedure must be performed after replacing the TCM and/or the valve body to ensure proper shift quality. It is also recommended after a battery disconnect or software flash to relearn shift adapts.
• wiTECH or equivalent dealer-level scanner: PROXI Configuration Alignment — This function, found under the Body Control Module (BCM) menu, is required after replacing the TCM to ensure all modules on the vehicle network recognize and communicate with the new module.

Wiring & Ground Locations

• TCM (Transmission Control Module) — Mounted directly on the front of the transaxle. It is best accessed by removing the driver's side front wheel and looking through the opening rearward of the suspension strut.. This is the module sending the implausible data. Its location makes its harness susceptible to damage from road debris and wheel well moisture.
• Engine Wiring Harness Chafe Point — The main engine harness has a tendency to hang and rub on metal hose clamps for coolant lines and on the edges of other components in the engine bay.. A chafed harness can cause a short or open in the CAN bus wires running between the TCM and PCM, directly causing the U0402 code.
• G909A / G904A — These are the TCM ground circuit designators. G909A is for the 2.4L engine and G904A is for the 3.6L engine. These grounds secure to the chassis in the engine compartment.. A poor ground connection for the TCM can introduce electrical noise or cause voltage drops, leading to corrupted data transmission and the U0402 code.

Real Owner Repair Stories

• Reddit user Drgoo702 in r/chrysler200 (2015 Chrysler 200 2.4L) — Erratic transmission behavior similar to what the original poster described for code U0402.
  ❌ Tried (didn't work) The user did not list other attempts, but directly referenced the successful fix.
  ✅ What actually fixed it The user stated that their transmission used to have the same problems until the dealership 'flashed and updated the TCM' as part of a recall.