Pinpoint Tests AM: DTC U0127

Instrumentation and Warning Chimes

Pinpoint Tests

Pinpoint Test AM: DTC U0127

- DTC U0127 (Lost Communication With Tire Pressure Monitor Module) - sets in continuous memory if data messages received from the Tire Pressure Monitoring System (TPMS) module over the Medium Speed Controller Area Network (MS-CAN) are missing for greater than 5 seconds.

This pinpoint test is intended to diagnose the following:

- TPMS
- Instrument Cluster (IC)



PINPOINT TEST AM: DTC U0127

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AM1 VERIFY THE CUSTOMER CONCERN


- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to AM2.

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.

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AM2 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the TPMS module pass the network test?

Yes
GO to AM3.

No
REFER to Information Bus.

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AM3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?

Yes
GO to Pinpoint Test AG (B1317) or GO to Pinpoint Test AH (B1318). Pinpoint Tests AG: DTC B1317 Pinpoint Tests AH: DTC B1318

No
GO to AM4.

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AM4 RECHECK THE IC DTCs


- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0127 still present?

Yes
INSTALL a new TPMS module. REFER to Wheels and Tires. CLEAR the DTCs. REPEAT the IC self-test.

If DTC U0127 is still present, INSTALL a new IC. REFER to Instrument Cluster (IC) Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic.

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