What Does B00E4 Mean?
This code indicates a fault in the deployment control circuit for the second row right seatbelt pretensioner circuit C. The Body Control Module (BCM) or Restraint Control Module (RCM) has detected an electrical abnormality in the pretensioner firing circuit, such as high/low resistance, open circuit, or short circuit. The subfault designation suggests a secondary or intermittent issue within the pretensioner system that prevents proper deployment readiness.
Safety Warning
This is a critical safety system fault that disables the seatbelt pretensioner for the second row right occupant, meaning the seatbelt will not tighten during a collision to properly restrain the occupant. The vehicle is technically drivable but occupant protection is compromised; repair should be performed immediately, especially if this seating position is regularly occupied.
Common Causes
35%
Faulty seatbelt pretensioner unit with internal circuit degradation or damaged squib
30%
Damaged, corroded, or loose wiring harness connector at pretensioner or control module
20%
Short to ground or open circuit in pretensioner wiring between control module and pretensioner
10%
Faulty Restraint Control Module (RCM) or Body Control Module with pretensioner driver circuit failure
5%
Previous deployment event not properly reset or residual fault from crash sensor activation
Diagnostic Steps
1
Step 1: Perform visual inspection of second row right seatbelt pretensioner and wiring harness for physical damage, corrosion, water intrusion, or signs of previous deployment. Check connector for bent pins, corrosion, or loose fit.
2
Step 2: Using a digital multimeter, measure resistance across the pretensioner squib terminals (with pretensioner disconnected and ignition OFF). Typical squib resistance should be 1.5-3.5 ohms. Out-of-range readings indicate faulty pretensioner.
3
Step 3: Check continuity and resistance of wiring harness between the pretensioner connector and the restraint control module connector. Verify no short to ground, short to power, or open circuits exist. Wiggle test wiring while monitoring resistance for intermittent faults.
4
Step 4: Inspect restraint control module connectors for corrosion, damage, or moisture intrusion. Check ground connections associated with the restraint system for high resistance or corrosion.
5
Step 5: If all wiring and pretensioner resistance checks are within specification, suspect faulty restraint control module. Verify module has not recorded a deployment event that requires module replacement per manufacturer protocol.
6
Step 6: After repairs, clear codes, perform a drive cycle, and verify the airbag/restraint system warning light extinguishes. Use scan tool to verify pretensioner circuit shows ready status and no stored or pending codes return.
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
This code indicates a fault in the deployment control circuit for the second row right seatbelt pretensioner circuit C. The Body Control Module (BCM) or Restraint Control Module (RCM) has detected an electrical abnormality in the pretensioner firing circuit, such as high/low resistance, open circuit...
The most common cause of B00E4 (Second Row Right Seatbelt Pretensioner "C" Deployment Control (Subfault)) is: Faulty seatbelt pretensioner unit with internal circuit degradation or damaged squib
Typical repair costs for B00E4 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that disables the seatbelt pretensioner for the second row right occupant, meaning the seatbelt will not tighten during a collision to properly restrain the occupant. The vehicle is technically drivable but occupant protection is compromised; repair should be performed immediately, especially if this seating position is regularly occupied.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00E4 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Airbag System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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