Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Ford Flex Limited, FWDFACTORY OEM SERVICE PROCEDURE
Vehicle Dynamic Systems
ABS MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| B1342 | ECU is Faulted | CLEAR the DTCs. CYCLE the ignition switch. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . REPEAT the self-test. |
| B1596 | Service Continuous Codes | This DTC is only an indicator that other DTCs are present. This DTC will set after clearing DTCs with the scan tool. An ignition key-cycle from OFF to RUN is required to set this DTC as a continuous memory DTC which will allow the ABS module to check for other on-demand DTCs. CLEAR the DTCs. CYCLE the ignition switch. RETRIEVE the DTCs. If only DTC B1596 is present, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . REPEAT the self-test. |
| B1676 | Battery Pack Voltage Out of Range | Go To PINPOINT TEST A . |
| B2477 | Module Configuration Failure | CONFIGURE the ABS module using as-built data and correct tire size. REFER to Programmable Module Installation (PMI) in MODULE CONFIGURATION . CYCLE the ignition switch and REPEAT the self test. If DTC B2477 is retrieved again, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . REPEAT the self-test. |
| B2900 | VIN Mismatched | Go To PINPOINT TEST F . |
| C1145 | Wheel Speed Sensor RF Input Circuit Failure | Go To PINPOINT TEST B . |
| C1155 | Wheel Speed Sensor LF Input Circuit Failure | Go To PINPOINT TEST B . |
| C1165 | Wheel Speed Sensor RR Input Circuit Failure | Go To PINPOINT TEST B . |
| C1175 | Wheel Speed Sensor LR Input Circuit Failure | Go To PINPOINT TEST B . |
| C1222 | Wheel Speed Sensor Mismatch | Go To PINPOINT TEST C . |
| C1266 | ABS Valve Power Relay Circuit Failure | Go To PINPOINT TEST D . |
| C1278 | Steering Wheel Angle 1 and 2 Signal Faulted | Go To PINPOINT TEST H . |
| C1279 | Yaw Rate Sensor Circuit Failure | Go To PINPOINT TEST I . |
| C1280 | Yaw Rate Sensor Signal Fault | Go To PINPOINT TEST I . |
| C1281 | Lateral Acceleration Sensor Circuit Fault | Go To PINPOINT TEST I . |
| C1282 | Lateral Accelerometer Signal Fault | Go To PINPOINT TEST I . |
| C1288 | Pressure Transducer Main/Primary Input Circuit Failure | Go To PINPOINT TEST J . |
| C1296 | Wheel Speed LF Signal Fault | Go To PINPOINT TEST C . |
| C1297 | Wheel Speed RF Signal Fault | Go To PINPOINT TEST C . |
| C1298 | Wheel Speed RR Signal Fault | Go To PINPOINT TEST C . |
| C1299 | Wheel Speed LR Signal Fault | Go To PINPOINT TEST C . |
| C1300 | ABS Hydraulic Pump Motor Circuit Failure | Go To PINPOINT TEST E . |
| C1440 | Pressure Transducer Main/Primary Signal Faulted | Go To PINPOINT TEST J . |
| C1446 | Brake ON/OFF Plausibility Fault(s) | Go To PINPOINT TEST J . |
| C1516 | Roll Rate Sensor Signal Fault | Go To PINPOINT TEST I . |
| C1517 | Roll Rate Sensor Circuit Fault | Go To PINPOINT TEST I . |
| C1805 | Mismatched PCM and/or ABS-TC Module | CONFIGURE the ABS module using as-built data and correct tire size. REFER to PMI in MODULE CONFIGURATION . CYCLE the ignition switch and REPEAT the self test. If DTC C1805 is retrieved again, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . REPEAT the self-test. |
| C1956 | Steering Angle Sensor Circuit Failure | Go To PINPOINT TEST H . |
| C1963 | Stability Assist Inhibit Warning |
NOTE:
This DTC will not clear until the vehicle has been driven above 48 km/h (30 mph) with input from the steering wheel rotation sensor. REPAIR all other steering wheel angle sensor and stability control sensor cluster DTCs before repairing DTC C1963.Go To PINPOINT TEST H
. |
| C1975 | IVD Plausibility Failure | REPAIR all other steering wheel angle sensor and stability control sensor cluster DTCs before repairing DTC C1975. Go To PINPOINT TEST H . |
| C2769 | Longitudinal Acceleration Sensor Circuit Fault | Go To PINPOINT TEST I . |
| C2770 | Longitudinal Acceleration Sensor Signal Fault | Go To PINPOINT TEST I . |
| U0073 | Control Module Communication Bus A Off | REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication concern. |
| U0074 | Control Module Communication Bus B Off | Go To PINPOINT TEST I . |
| U0100 | Lost Communication With Engine Control Module (ECM)/PCM | REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication concern. |
| U0155 | Lost Communication With Instrument Panel Cluster Control Module | REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication concern. |
| U0102 | Lost Communication With Transfer Case Control Module | REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication concern. |
| U2023 | Fault Received From External Node | If any other communication DTCs are present in the ABS module, DIAGNOSE those first. CLEAR all ABS module DTCs. DRIVE the vehicle. If the DTC is still present, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . |
| U2050 | No Application Present | CONFIGURE the ABS module. REFER to PMI in MODULE CONFIGURATION . CLEAR the DTCs. RETRIEVE the DTCs. If DTC U2050 is retrieved again, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CLEAR the DTC. REPEAT the self-test. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.