AutoCodes - OBDII Code List - B0091 CHEVROLET

B0091 CHEVROLET - Front End Sensor 3 Erratic

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

B0091 CHEVROLET Possible Causes

  • Faulty Front End Sensor 3
  • Front End Sensor 3 harness is open or shorted
  • Front End Sensor 3 circuit poor electrical connection
  • Faulty Inflatable Restraint Sensing and Diagnostic Module (SDM)

How do I fix code B0091 CHEVROLET?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Tech Notes

DTC B0091 00 Front End Sensor 3 No Additional Information (Center)
DTC B0091 01 Front End Sensor 3 Short to Battery (Center)
DTC B0091 02 Front End Sensor 3 Short to Ground (Center)
DTC B0091 05 Front End Sensor 3 Short to Battery or Open (Center)
DTC B0091 0F Front End Sensor 3 Erratic (Center)
DTC B0091 39 Front End Sensor 3 Internal Electronic Failure (Center)
DTC B0091 3A Front End Sensor 3 Incorrect Component Installed (Center)
DTC B0091 71 Front End Sensor 3 Invalid Serial Data Received (Center)

Cost of diagnosing the B0091 CHEVROLET code

Labor: 1.0

The cost of diagnosing the B0091 CHEVROLET code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Possible Symptoms

  • Air Bag Warning Light ON

B0091 CHEVROLET Description

The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID, state of health, and deployment commands to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The SDM serves as a power source and a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit. When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.
OBDII Code B0091 Chevrolet - Front End Sensor 3 Erratic -

More Information

Need more information on how to fix the B0091 CHEVROLET code?
Get Access to Factory Service Manuals

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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