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.
Pinpoint Test H: DTCs B2900 and C1805
2010 Lincoln MKZ FWD V6-3.5LSECTION Pinpoint Test H: DTCs B2900 and C1805
Anti-Lock Control - Non-Hybrid
Pinpoint Tests
Pinpoint Test H: DTCs B2900 and C1805
Refer to Wiring Diagram Set 42 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
When the ignition is turned to the RUN position, the ABS module and the PCM share Vehicle Identification Number (VIN) information over the High Speed Controller Area Network (HS-CAN) bus.
- DTC B2900 ( VIN Mismatched) - If the VIN information stored in the ABS module does not match the information transmitted by the PCM, DTC B2900 will set.
- DTC C1805 (Mismatched PCM and/or ABS Module) - If the VIN information stored in the ABS module does not match the information transmitted by the PCM, DTC C1805 will set.
This pinpoint test is intended to diagnose the following:
- Module configuration (ABS and PCM)
- ABS module
PINPOINT TEST H: DTCs B2900 AND C1805
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H1 VERIFY PCM VIN
- Connect the scan tool.
- Ignition ON.
- Using the scan tool, carry out the Network Test.
- Enter the following diagnostic mode on the scan tool: Log Viewer.
- Compare the VIN in Log Viewer to the vehicle VIN plate.
- Does VIN in Log Viewer match the vehicle VIN plate?
Yes
GO to H2.
No
RECONFIGURE the PCM. FOLLOW the instructions on the scan tool. CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
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H2 VERIFY ABS MODULE PART NUMBER
- Retrieve and record the ABS module part number from Log Viewer and verify that the vehicle has the correct ABS module installed.
- Is the correct ABS module installed in the vehicle?
Yes
CONFIGURE the ABS module. REFER to Programmable Module Installation (PMI) Using the Integrated Diagnostic System (IDS) When the Original Module is NOT Available in Information Bus. CLEAR the DTC. CYCLE the ignition key. REPEAT the self-test. Programmable Module Installation (PMI) Using the Integrated Diagnostic System (IDS) When the Original Module is Not Available
No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. CLEAR the DTC. CYCLE the ignition key. REPEAT the self-test.
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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.