GMC Yukon 2000–2006
Common on this vehicle:
Possible causes
The documents say what to doOnly records name itThe size of a node, the width of a link and the numbers are records matching this search, not likelihoods.
FaultCrate・GMC Yukon 2000–2006・Security light
Candidate cause (the documents say what to do)
Passlock theft deterrent: starts then stalls / no-start with security lamp
A magnet in the ignition cylinder produces a unique voltage across a Hall effect sensor in the ignition housing; the BCM and lock cylinder enable starting.
If the voltage matches the stored value, the BCM signals the PCM to enable fuel.
How to tell
B2960P1631Security light
What to do
- A security lamp flashing after an attempted start means the fuel disable command is active.
- A scan tool parameter showing 'fuel system disabled' or similar indicates a Passlock issue.
- Monitor the Passlock Data Voltage for approximately one minute; the voltage value should not change by more than .02 volt.
- If the voltage does not change from 5 volts, check the ignition housing.
- The condition is the Security lamp illuminated on the instrument panel, engine stalls or no start, with DTC B2960 (Security System Sensor Data Incorrect but Valid) set; the correction is to inspect and repair the cause of DTC B2960.
Caution: Loss of Ignition 1 voltage to the BCM gives the same start-then-stall behaviour.
What is needed
- Parts and materials
- Not stated
- Labor time
- Not stated
- Special tools
- Not stated
- Scan tool
- Not stated
Only what the technical documents state. "Not stated" does not mean not needed.
In the records
No record states work done for this cause.
See the evidence (1 technical documents, 0 records)
Passages of the technical documents
A magnet in the ignition cylinder produces a unique voltage across a Hall effect sensor in the ignition housing; the BCM and lock cylinder enable starting.
The GM VTD or Passlock system uses the body control module (BCM) and ignition lock cylinder to activate the start function. The ignition cylinder uses a magnet that produces a unique voltage value when rotated in the ignition housing across the Hall effect sensor.
MOTOR Magazine 2006-04-01
If the voltage matches the stored value, the BCM signals the PCM to enable fuel.
The BCM compares this voltage value to the value stored in the BCM. If the voltage values are the same, the BCM sends a signal to the powertrain control module to enable fuel.
MOTOR Magazine 2006-04-01
If the values do not match, the engine briefly starts and then stalls.
If the voltage values are not the same, the engine will briefly start, then stall.
MOTOR Magazine 2006-04-01
A security lamp flashing after an attempted start means the fuel disable command is active.
The quickest way is to look at the security indicator lamp on the instrument panel. If it’s flashing after an attempted start, the fuel disable command has been energized.
MOTOR Magazine 2006-04-01
A cause or a result a complaint states is the owner’s view or what a dealer told them, not an established fact.
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.