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 I: DTC U0140:00
- I1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
Is an observable symptom present?
- Yes : GO to I2 .
- No : The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
- I2 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a scan tool, carry out the network test.
Does the BCM pass the network test?
- Yes : GO to I3 .
- No : REFER to MODULE COMMUNICATIONS NETWORK .
- I3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND BCM SELF-TESTS
- Check for recorded ABS module and BCM DTCs from the network test.
Is DTC U3003:16 (or B1318) or DTC U3003:17 (or B1317) recorded?
- Yes
: For the ABS module, REFER to DTC CHARTS .
For the BCM , REFER to MULTIFUNCTION ELECTRONIC MODULES .
- No : GO to I4 .
- I4 CHECK FOR DTC U0140:00 SET IN OTHER MODULES
- Using a scan tool, clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test - All CMDTCs .
Is DTC U0140:00 or DTC U0140 set in more than one module?
- Yes : INSTALL a new BCM . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation. CLEAR the DTCs. REPEAT the ABS module self-test
- No
: For vehicles without adaptive cruise control, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.
For vehicles with adaptive cruise control, INSTALL a new HCU . REFER to HYDRAULIC CONTROL UNIT (HCU) .
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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.