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 D: B10D7:8F
- Normal Operation and Fault Conditions
When the ignition transitions to RUN or START, the BCM activates the PATS transceiver to read the key in the ignition lock cylinder. If the BCM does not receive a PATS key code or if the code is invalid, the PATS prevents the vehicle from starting.
REFER to: Passive Anti-Theft System (PATS) - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCM B10D7:8F PATS Key: Erratic Sets when the BCM reads a partial or corrupt PATS key read. Possible Sources
- Radio frequency interference
- PATS key
- PATS transceiver
Visual Inspection and Pre-checks
- Inspect the PATS key for damage.
- Verify the correct key is used.
- NOTE: This pinpoint test requires a second programmed PATS key. If only one key is available, obtain a second programmed PATS key.
- D1 CHECK THE PATS (PASSIVE ANTI-THEFT SYSTEM) KEY
- Verify the correct PATS keys are used with the vehicle. Refer to the parts catalog.
Are the correct PATS keys used?
Yes GO to D2 No OBTAIN the correct key(s) for the vehicle. PROGRAM the new key(s). REFER to: Anti-Theft Key Programming - Scan Tool . - D2 CHECK FOR RADIO FREQUENCY INTERFERENCE
- Check for metallic objects or other electronic devices on the same key ring, such as a second PATS key for another vehicle or other transponder type of device.
Are any items identified on the key ring that may cause radio frequency interference?
Yes REMOVE the programmed key from the key ring. TEST the system for normal operation. If the concern is still present, GO to D3
If the concern is no longer present, INFORM the customer of the cause of the concern.No GO to D3 - D3 ISOLATE THE PATS (PASSIVE ANTI-THEFT SYSTEM) KEYS
- Place the first PATS key in the ignition lock cylinder.
- Ignition ON.
- Using a diagnostic scan tool, clear the BCM Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Using a diagnostic scan tool, perform the BCM self-test. Record the results.
- Record the results from the BCM self-test.
- Using a diagnostic scan tool, clear the BCM Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Insert the customer's second key.
- Ignition ON.
- Using a diagnostic scan tool, perform the BCM self-test. Record the results.
- Record the results from the BCM self-test.
Is DTC B10D7:8F retrieved for both keys?
Yes INSTALL a new PATS transceiver. REFER to: Passive Anti-Theft System (PATS) Transceiver . No DISCARD the key in question and PROGRAM a new key. REFER to: Anti-Theft Key Programming - Scan Tool .
NO RELATED
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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.