Tire Pressure Module (TPM)

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







- 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.





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. TEST FOR INTERMITTENT CONDITION
1. With the scan tool, record and erase DTCs.
2. Start the engine and run for two minutes.
3. With the scan tool, read DTCs.

Does the scan tool display: B21DD84-BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD?

Yes

- Go To 3

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 Test.

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 high resistance.
- Perform the TPM VERIFICATION TEST. TPM Verification Test.

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 Module (TPM).
- Perform the TPM VERIFICATION TEST. TPM Verification Test.

No

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