P0929 on 2021-2025 Ford F-150: Gear Shift Module Causes and Fixes

What's Unique About the 2021-2025 Ford F-150

The fourteenth-generation F-150 (2021-present) utilizes a sophisticated electronic Gear Shift Module (GSM), especially with the popular console shifter with a stow-away feature. This module is a known failure point, as documented in multiple Ford Technical Service Bulletins (TSBs) like TSB 25-2045 and TSB 26-2066. Unlike older, more robust mechanical linkages, this electronic module is prone to internal faults and specific wiring issues that trigger code P0929, often accompanied by a wrench light on the dash and the inability to shift or stow the shifter.

Diagnostic Flowchart

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

Symptoms You May Notice

• Illuminated powertrain malfunction (wrench) indicator.
• "Service Vehicle Soon" message displayed on the dash.
• Unable to shift into or out of Park.
• Gear shifter will not stow or gets stuck in the stowed position (on models with the folding shifter).
• Gear shifter lever feels loose or moves past the Park position.
• Clicking sound from the shifter area, even when in Reverse, Neutral, or Drive (noted specifically for 2024 models in TSBs).
• "Powertrain Malfunction / Reduced Power" message in the FordPass app.

Most Likely Causes

1. Faulty Gear Shift Module (GSM) 🔴 High Probability Ford has issued multiple superseding Technical Service Bulletins (TSBs), such as TSB 25-2045 and TSB 26-2066, identifying an internal failure of the GSM as the primary cause for this code on these model years. Owner forums for the F-150 and F-150 Lightning are filled with reports of this specific part failing and being replaced by dealers under warranty. TSB 25-2579 even provides instructions for technicians to check the build date on the GSM, suggesting a known manufacturing defect in units built on or before August 28, 2025.
   How to confirm: A technician will use a Ford-specific scan tool (FDRS) to confirm internal faults in the GSM. The diagnosis involves first ruling out the less common wiring issues per the TSBs. If wiring is good, the GSM is condemned.
   Typical fix: Replacement of the Gear Shift Module. The new module must be programmed to the vehicle using a process called Programmable Module Installation (PMI) and TRON Module Authentication.
   Est. part cost: $350-$450
2. Wiring or Connector Issue 🟡 Medium Probability TSB 25-2276 and TSB 25-2045 specifically call out a pushed-out pin in connector C211 (pin 3) or an open on circuit CCB61 as a possible cause. This connector is located behind the glove box. Vibration and manufacturing tolerances can lead to these connection failures.
   How to confirm: Visually inspect both sides of connector C211, pin 3, for pushed-out pins, corrosion, or damage. A multimeter is used to perform a continuity test on circuit CCB61 between the ABS module (connector C135) and the Body Control Module (BCM, connector C2280A/B) as per the factory service manual.
   Typical fix: Repairing the affected circuit by reseating the pin or fixing the broken wire. This is much cheaper than replacing the module if it's the root cause.
   Est. part cost: $0-$50

Rare But Worth Checking

• Software Glitch in the GSM: In some cases, particularly on newer models, the issue can be software-related. TSB SSM 51057, which applies to some 2022 Ford models, notes that DTC P0929:77 can be caused by a software issue that can be resolved by reprogramming the GSM with the latest software level. 🎬 Watch: How to update your Ford's software using the FDRS system. Some owners of Ford Edge/Explorer models with similar issues have also had success with a software update.

Diagnosis Steps

1. Connect a Ford-compatible diagnostic scan tool (like FDRS) to read codes from all modules, not just the generic engine codes. Note the specific P0929 suffix (e.g., :77, :00, :07).
2. Verify the symptoms. Check if the shifter feels loose, moves past Park, or fails to stow, as described in Ford's TSBs.
3. Following the guidance in TSB 25-2045 or 25-2276, locate and inspect connector C211, which is behind the glove box. Carefully check pin 3 for pins that have backed out ('pin push out'), corrosion, or loose connections.
4. If a wiring fault is found at C211, repair it, clear the codes, and re-test.
5. If C211 is intact, perform a continuity test on circuit CCB61 between the ABS module and the BCM to check for an open circuit.
6. If the wiring and connector are intact, the Gear Shift Module (GSM) is the confirmed cause of the fault.
7. Replace the GSM. This involves removing the center console trim to access the module. 🎬 Watch: How to remove the center console to access the shifter. Note that TSB 25-2579 adds 0.1 labor hours if the lever is stuck in the stowed position.
8. After physical replacement, perform PMI (Programmable Module Installation) and the TRON Module Authentication Procedure using a Ford scan tool to program the new module to the vehicle.
9. After replacement and programming, clear all DTCs and verify that the shifter operates correctly and no warning lights return.

Parts You'll Likely Need

• Gear Shift Module (GSM) (OEM #ML3Z-7210-AB) — This module is the electronic brain for the gear shifter and is identified by Ford in multiple TSBs as the primary failure point for code P0929. It is referred to as 'Causal Part: 7210' in warranty claims.
  Trusted brands: Motorcraft
  OEM price range: $390-$450
  Aftermarket price range: N/A

Related Codes That Often Appear With This One

• P0929:77 — This is the most common variant of the code, cited in multiple TSBs and owner complaints, specifically indicating a 'Commanded Position Not Reachable' fault with the actuator.
• U211B-87 — An owner complaint documented this code alongside P0929. It means 'Control Module Message Authentication' failure, indicating a communication problem consistent with a failing GSM.
• P0929:00, P0929:07, P0929:9A — These are other variants of the P0929 code also listed in Ford's TSBs related to the same GSM failure.

Technical Service Bulletins (TSBs) & Recalls

• TSB 26-2066: Supersedes 25-2579. Covers 2021-2025 models built on/before 8-Sep-2025. Clarifies symptoms and points to GSM replacement.
• TSB 25-2579: Covers 2021-2025 models. Instructs technicians to check the GSM build date, indicating a known batch of faulty parts.
• TSB 25-2276: Superseded by TSB 25-2324. Cites the GSM and a specific wiring circuit (C211, CCB61) as causes for P0929 on 2021-2025 models.
• TSB 25-2045: A key bulletin that consolidates information for 2021-2024 models, detailing diagnostic steps for P0929 variants and pointing to the GSM or related wiring.

Platform-Specific Known Issues

• Ford has issued a cascade of TSBs for this issue, with newer ones superseding older ones. Key bulletins include TSB 25-2045, TSB 25-2276, TSB 25-2579, and TSB 26-2066, all pointing to the GSM or its wiring.
• Owner complaints filed with the NHTSA confirm this issue occurring in the real world, with one owner of a 2024 F-150 reporting code P0929-77.
• A specific wiring failure is detailed in TSB 25-2276, which identifies a potential pin push-out issue in connector C211 on circuit CCB61. The connector is located behind the glove box.
• The F-150 Lightning is explicitly included in the affected vehicles and shares the same GSM failure mode, as documented in TSBs and owner forums.

Mechanic-Grade Diagnostic Values

• Brake Pedal Switch PID 'BRK_PDL_SW2' status in BCM — expected: PID status should change when the brake pedal is pressed and released.. Failure: If the PID status does not change, it indicates a problem with the brake pedal switch circuit that needs to be diagnosed before addressing the GSM.

Scan Tool Commands That Help

• Ford Diagnosis and Repair System (FDRS): Programmable Module Installation (PMI) — This procedure is mandatory after replacing the Gear Shift Module (GSM). It configures the new module to the vehicle. The process may involve 'inhaling' data from the old module before swapping, then 'exhaling' it to the new one.
• Ford Diagnosis and Repair System (FDRS): TRON Module Authentication Procedure — Specifically required for 2024-2025 vehicles after replacing the GSM, as per TSB 26-2066. This is a security and authentication step performed after the PMI.

Wiring & Ground Locations

• Connector C211, Pin 3 — Located behind the glove box.. Ford TSBs 25-2276 and 25-2324 identify a pushed-out pin or poor fitment at this specific pin as a potential cause for P0929, interrupting communication.
• Circuit CCB61 — This circuit runs between the ABS module and the Body Control Module (BCM), passing through connector C211.. An open (break) in this circuit is a known cause of P0929 according to Ford TSBs. Diagnosis requires a continuity test if a visual inspection of connector C211 reveals no issues.

Real Owner Repair Stories

• f150forum.com user 'Griffalo' (2024 Ford F-150 XLT) — Powertrain malfunction (wrench) light appeared four times over 10 days. The folding gear shifter got stuck in the down position twice, requiring a battery disconnect to reset and raise it. Scanned code P0929.
  ❌ Tried (didn't work) Intermittent fault continued despite vehicle restarts.
  ✅ What actually fixed it Vehicle was taken to the dealer with the diagnosis of a faulty Gear Shift Module (GSM). The expected fix is the replacement of the GSM.

OEM Part Supersession History

• ML3Z-7210-AB → ML3Z-7210-AT — Likely an internal revision to improve reliability and address the failures causing P0929. Ford frequently supersedes parts to introduce running changes.
  Heads up: ML3Z-7210-AT is the correct service part and replaces multiple previous versions, including ML3Z-7210-AB, ML3Z-7210-AL, ML3Z-7210-B, ML3Z-7210-J, and ML3Z-7210-Q. Always confirm the part number with the vehicle's VIN.

Model Year Variations Within This Range

• 2021-2025: TSB 26-2066 instructs technicians to check the build date on the GSM. If the module was built on or before August 28, 2025, and the vehicle exhibits the symptoms, the module should be replaced, suggesting a known faulty batch of parts.
• 2024-2025: When replacing the GSM on these model years, the 'TRON Module Authentication Procedure' is explicitly required in addition to the standard PMI process.
• 2024 only: TSB 25-2045 notes that a 'clicking sound coming from shifter after it is placed and kept in reverse, neutral or drive position' is a symptom specific to 2024 models.