P0978 on 2015 Chrysler 200: Shift Solenoid 'C' Circuit Fixes

What's Unique About the 2015-2015 Chrysler 200

The 2015 Chrysler 200 uses the ZF 9HP48 9-speed automatic transmission (also known as 948TE) 🎬 Watch: A deep dive into how this 9-speed transmission works., which is notorious for a history of shifting complaints and numerous software updates, especially in its early release years. For this specific vehicle, P0978 is frequently linked to software glitches that can be resolved by a dealer reprogramming the TCM, as outlined in multiple Technical Service Bulletins (TSBs) like 21-019-17 REV. A. Unlike many vehicles where a solenoid is a straightforward mechanical replacement, on the 200, the first and most critical step is to check for available software updates before condemning any hardware, as this was Chrysler's primary method for addressing widespread shift quality complaints.

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 is on
• Harsh, erratic, or delayed shifting
• Vehicle gets stuck in a single gear (limp mode)
• Inability to shift into higher gears
• Increased fuel consumption
• Vehicle may stall when coming to a stop

Most Likely Causes

1. TCM Software Out of Date 🔴 High Probability Chrysler released multiple TSBs (e.g., 21-019-17 REV. A) to address P0978 and other solenoid codes via software updates for the ZF 9-speed transmission, particularly for the 2.4L engine. Early versions of the transmission software were plagued with issues.
   How to confirm: A dealership or a shop with a subscription to OEM service information can check if the vehicle's TCM software is current using a wiTECH scan tool. They can cross-reference the installed software version with the latest version listed in the TSBs.
   Typical fix: Reprogramming (flashing) the Transmission Control Module with the latest available software. This is a dealer-level procedure.
   Est. part cost: $0
2. Faulty Shift Solenoid / Valve Body 🟡 Medium Probability The solenoids are integrated into the valve body assembly inside the transmission. Contaminated fluid or simple electronic failure can cause issues. The ZF 9-speed has a complex valve body, and failure of a single solenoid often requires replacement of the whole unit.
   How to confirm: After confirming the wiring is intact and software is updated, a technician can use a high-end scan tool to command the solenoid and monitor its response. If it fails to respond correctly, it is deemed faulty. Resistance checks can also be performed, but access is internal.
   Typical fix: Replace the entire transmission valve body assembly, which includes all the shift solenoids. This is a significant repair that involves removing the transmission pan.
   Est. part cost: $400-$900
3. Wiring Harness Issue 🟡 Medium Probability NHTSA recall 16V-529000 was issued for insufficient crimps in the transmission wire harness on 2015 Chrysler 200s, which could lead to solenoid fault codes and a sudden shift to neutral. Also, recall R24 (NHTSA 15V-470000) involved replacing the entire transmission wiring harness on 2.4L models for a separate connector issue.
   How to confirm: Visually inspect the external harness for damage. Test for continuity and resistance between the TCM connector and the transmission connector using a digital multimeter (DVOM) and a vehicle-specific wiring diagram.
   Typical fix: Repair the damaged section of the wiring harness or replace the entire harness, depending on the fault location and severity. The recall fix involved replacing the harness.
   Est. part cost: $20-$500
4. Low or Contaminated Transmission Fluid ⚪ Low Probability
   How to confirm: Check the transmission fluid level and condition. The fluid should be at the correct level, have a reddish hue, and not smell burnt. Note: The ZF 9HP48 transmission does not have a traditional dipstick; checking the level is a complex, temperature-dependent procedure 🎬 See this walkthrough for checking and changing the transmission fluid. requiring a scan tool and a lift.
   Typical fix: Perform a transmission fluid drain and fill with the correct Mopar ZF 8&9 Speed ATF or equivalent (e.g., ZF Lifeguard 9). Using the wrong fluid can cause severe damage.
   Est. part cost: $150-$350

Rare But Worth Checking

• Faulty Transmission Control Module (TCM): While software issues are common, complete hardware failure of the TCM itself can also occur. This is less likely than a solenoid or wiring fault and should be considered after all other possibilities are exhausted.

Diagnosis Steps

1. Scan the TCM for all stored trouble codes. Note any other codes that appear with P0978, as they can provide critical diagnostic clues.
2. Crucially, check for applicable software updates. Use a dealer-level tool (wiTECH) to check the current TCM software version against TSBs like 21-019-17 REV. A. If an update is available, perform the flash procedure first, as this is the most common fix.
3. Check for any open recalls, especially NHTSA 16V-529000 (harness crimps) and 15V-470000 (PDC connector/harness).
4. If software is current, perform a thorough visual inspection of the external transmission wiring harness and connectors for any signs of damage, corrosion, or loose connections.
5. Using a wiring diagram, disconnect the TCM and transmission connectors and test the solenoid 'C' circuit for proper resistance and continuity with a multimeter. Check for shorts to power or ground.
6. Inspect the transmission fluid level and condition. This is difficult on this model and must be done at a specific temperature, likely requiring a professional.
7. If wiring and software are confirmed good, the fault is highly likely to be the shift solenoid itself, which is part of the valve body.
8. Replace the transmission valve body assembly. This involves draining the fluid, removing the pan, and carefully disconnecting the old valve body.
9. After replacement, install a new pan gasket, fill with the correct Mopar ZF 8&9 Speed ATF, and perform all required TCM relearn procedures (e.g., Quick Learn) with a compatible scan tool.

Parts You'll Likely Need

• Transmission Valve Body Assembly (OEM #68372073AA (Verify with VIN)) — The shift solenoids are integrated into the valve body. If a solenoid fails electronically or mechanically, the entire assembly is replaced. This part often includes the new solenoids and TCM.
  Trusted brands: Mopar, ZF
  OEM price range: $700-$1100
  Aftermarket price range: $500-$800
• Mopar ZF 8 & 9 Speed ATF HP (OEM #68218925AB (or 68218925AA)) — This is the specific fluid required for the 9HP48 transmission. Using any other fluid type can cause poor shifting and severe internal damage.
  Trusted brands: Mopar (OEM), ZF Lifeguard 9
  OEM price range: $35-$55 per liter
  Aftermarket price range: $25-$40 per liter
• Transmission Pan Gasket — The gasket must be replaced anytime the transmission pan is removed for service, such as a valve body replacement, to prevent leaks.
  Trusted brands: Mopar, Fel-Pro
  OEM price range: $30-$50
  Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

• P0975 — This code is for Shift Solenoid 'B' Control Circuit Performance, and TSB 21-019-17 REV. A lists it alongside P0978, indicating a common underlying software cause.
• P0887 — This code is for the TCM Power Control Circuit High, and it is often grouped with solenoid codes in Chrysler TSBs for this transmission, pointing to a related software or electrical issue.
• P0981 — This code is for Shift Solenoid 'D' Control Circuit Performance and is also mentioned in the same TSBs as P0978, suggesting a group of faults fixed by the same software update.

Technical Service Bulletins (TSBs) & Recalls

• 21-019-17 REV. A: The most relevant TSB. It explicitly lists P0978-00 - Shift Solenoid 3 Control Circuit Performance as a code addressed by a TCM software update for 'Transmission Diagnostic and Shift Enhancements' on the 2015 Chrysler 200 (UF).
• 21-015-16: Also lists P0978-00 as part of a group of codes that can be addressed by a TCM software update.
• 21-021-15 REV-E: An earlier TSB that also includes P0978-00 and involves reprogramming the TCM for shift quality improvements.
• Recall R24 / NHTSA 15V-470000: Addressed a Power Distribution Center (PDC) connector issue that could cause intermittent power, stalls, or shifts to neutral. The fix for 2.4L models was a complete replacement of the transmission wiring harness.

Platform-Specific Known Issues

• The 2015 Chrysler 200 was one of the first vehicles to use the ZF 9-speed transmission, and it was subject to numerous customer complaints about harsh shifting, lurching, and hesitation.
• Chrysler issued multiple TSBs (e.g., 21-019-17 REV. A, 21-015-16) that address P0978 and other solenoid codes with software updates, specifically for models with the 2.4L engine (sales codes ED6, ED8, EDD, EDE).
• A YouTube video by 'Pine Hollow Auto Diagnostics' titled 'EMERGENCY SUNDAY CALL: Ram ProMaster Transmission' shows a similar ZF 9-speed issue, highlighting the diagnostic complexity. While not a 200, it demonstrates the common failure modes of this transmission family.
• A video specifically on the 2015 Chrysler 200 shows that a complete loss of gear engagement can sometimes be caused by the TCM losing its VIN programming, often after a battery disconnect, which can be fixed with a 'PROXI Configuration Alignment' using a high-level scan tool.

Mechanic-Grade Diagnostic Values

• Shift Solenoid Resistance — expected: 3 - 10 ohms. Failure: A reading outside this range indicates a faulty solenoid.

Scan Tool Commands That Help

• wiTECH: Quick Learn — This procedure is required after the transmission is repaired/replaced, the valve body or TCM is replaced, or when adaptation memory cells are cleared. It is a first step to address shift quality complaints.
• wiTECH: VB/Solenoid Learn — This specific learn procedure must be run if the Valve Body or the TCM assembly is replaced to ensure proper shift quality.
• High-level scan tools (e.g., Snap-on, Autel): PROXI Configuration Alignment — This function is used to synchronize the VIN and configuration data between the Body Control Module (BCM) and other modules like the TCM. It can resolve no-start or no-gear-engagement issues that may occur after a battery dies or a module is replaced.

Wiring & Ground Locations

• Transmission Control Module (TCM) — Located on the transaxle. It is accessed by lifting the vehicle and removing the left front tire.. This is the control unit that sets code P0978. All circuit tests for the solenoid will originate or terminate at the TCM's main connector.
• TCM Main Connector — Plugs directly into the TCM, which is mounted on the transaxle behind the left front wheel.. This is the primary point for testing the solenoid circuit's continuity and checking for shorts to power or ground without having to open the transmission. A vehicle-specific wiring diagram is needed to identify the correct pins for the Shift Solenoid 'C' circuit.
• G300 — Under the driver's seat, on the floor pan.. While not directly for the TCM, this is a major body ground point. Poor grounds can cause a variety of unpredictable electrical issues and fault codes across multiple modules, so it's a relevant location to check for corrosion or looseness when diagnosing complex electrical faults.

Real Owner Repair Stories

• YouTube channel 'White Auto' (2015 Chrysler 200) — Car would not move when the gear shifter was turned. The vehicle had been parked for a couple of months, and the battery had died.
  ❌ Tried (didn't work) Replacing the rotary shifter assembly based on online advice.
  ✅ What actually fixed it The scan tool showed the TCM was 'not programmed' and had lost the vehicle's VIN. The fix was performing a 'PROXI Configuration Alignment' which reprogrammed the VIN from the BCM into the TCM, restoring communication and allowing the transmission to engage gears.

Model Year Variations Within This Range

• 2015: The 948TE valve body has two main variations: Park By Wire (PBW) and Park By Cable (PBC). The PBW version has 10 solenoids and is fully electronic, while the PBC version has 9 solenoids and uses a cable for the manual valve. They are not interchangeable. The clutch pack control solenoids are typically identifiable by their orange caps.