Tire Pressure Module (TPM)

B21DD-84-SYSTEM VOLTAGE - SIGNAL VOLTAGE BELOW ALLOWABLE RANGE





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously.

- Set Condition:
Anytime the Tire Pressure Monitoring (TPM) Module senses voltage input below 8.0 volts for over 20 ms, this code will set.





NOTE: Check for and remove any non-FCC compliant components before beginning this diagnostic procedure.

1. CHECK POWERTRAIN CONTROL MODULE (PCM) DTCs

NOTE: Make sure the battery is fully charged before proceeding.

1. Ignition on, engine not running.
2. With the scan tool, read PCM DTCs.

Are there any battery or charging system DTCs?

No

- Go To 2

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

2. VERIFY THE DTC IS ACTIVE
1. With the scan tool, record and erase stored DTCs.
2. Start the engine and run for two minutes.
3. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 3

No

- Go To 5

3. (A913) FUSED B(+) CIRCUIT OPEN OR HIGH RESISTANCE




1. Turn the ignition off to the lock position.
2. Disconnect the TPM harness connector.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, check (A913) Fused B(+) circuit in the Tire Pressure Module harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (A913) Fused B(+) circuit for an open or high resistance.
- Perform the TPM VERIFICATION TEST. TPM Verification.

4. (Z911) GROUND CIRCUIT OPEN OR HIGH RESISTANCE




1. Turn the ignition off to the lock position
2. Using a 12-volt test light connected to 12-volts, check the (Z911) Ground circuit in the Tire Pressure Module harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Replace the Tire Pressure Monitoring (TPM) Module. Tire Pressure Monitoring (TPM) Module - Removal.
- Perform the TPM VERIFICATION TEST. TPM Verification.

No

- Repair the (Z911) Ground circuit for an open or high resistance.
- Perform the TPM VERIFICATION TEST. TPM Verification.

5. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit.
5. Look for the data to change other than as expected or for the DTC to reset.

Were any problems found?

Yes

- Repair as necessary.
- Perform the TPM VERIFICATION TEST. TPM Verification.

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the TPM VERIFICATION TEST. TPM Verification.