Replacement (Rear Side Door) (See: Restraints and Safety Systems/Air Bag Systems/Impact Sensor/Service and Repair/Inflatable Restraint
Side Impact Sensor Replacement (Rear Side Door))
* Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Avalanche/Escalade EXT) (See: Restraints and Safety Systems/Air
Bag Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail (Rear)/Roof Side Rail Inflatable Restraint Module
Replacement (Rear Right, Avalanche/Escalade EXT))Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Standard
Wheelbase) (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail
(Rear)/Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Standard Wheelbase))Roof Side Rail Inflatable Restraint Module
Replacement (Rear Right, Standard Wheelbase) (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and Repair/Removal
and Replacement/Roof Side Rail (Rear)/Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Standard Wheelbase))Roof
Side Rail Inflatable Restraint Module Replacement (Front Left, Standard Wheelbase) (See: Restraints and Safety Systems/Air Bag
Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail (Front)/Roof Side Rail Inflatable Restraint Module
Replacement (Front Left, Standard Wheelbase))Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Extended Wheelbase)
(See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail (Front)/Roof
Side Rail Inflatable Restraint Module Replacement (Front Right, Extended Wheelbase))Roof Side Rail Inflatable Restraint Module
Replacement (Front Left, Extended Wheelbase) (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and Repair/Removal
and Replacement/Roof Side Rail (Front)/Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Extended Wheelbase))Roof
Side Rail Inflatable Restraint Module Replacement (Rear Left, Extended Wheelbase) (See: Restraints and Safety Systems/Air Bag
Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail (Rear)/Roof Side Rail Inflatable Restraint Module
Replacement (Rear Left, Extended Wheelbase))Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Avalanche/Escalade
EXT) (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail
(Rear)/Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Avalanche/Escalade EXT))Roof Side Rail Inflatable Restraint
Module Replacement (Rear Right, Extended Wheelbase) (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and
Repair/Removal and Replacement/Roof Side Rail (Rear)/Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Extended
Wheelbase))Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Standard Wheelbase) (See: Restraints and Safety
Systems/Air Bag Systems/Air Bag/Service and Repair/Removal and Replacement/Roof Side Rail (Front)/Roof Side Rail Inflatable Restraint
Module Replacement (Front Right, Standard Wheelbase))
* Seat Belt Retractor Pretensioner Replacement - Front (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt Tensioner/Service and
Repair/Removal and Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming
B051A
DTC B051A, B051B, B051C, or B051D
Diagnostic Instructions
-Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
-Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B051A 0B:Left Side Assist Step Motor Control Circuit Current Above Threshold
DTC B051A 01:Left Side Assist Step Motor Control Circuit Short to Battery
DTC B051A 02:Left Side Assist Step Motor Control Circuit Short to Ground
DTC B051A 04:Left Side Assist Step Motor Control Circuit Open Circuit
DTC B051B 0B:Right Side Assist Step Motor Control Circuit Current Above Threshold
DTC B051B 01:Right Side Assist Step Motor Control Circuit Short to Battery
DTC B051B 02:Right Side Assist Step Motor Control Circuit Short to Ground
DTC B051B 04:Right Side Assist Step Motor Control Circuit Open Circuit
DTC B051C 01:10 V Reference Circuit Short to Battery
DTC B051C 02:10 V Reference Circuit Short to Ground
DTC B051C 2A:Left Side Assist Step Position Sensor Circuit Too Many Pulses
DTC B051C 22:Left Side Assist Step Position Sensor Circuit Low Time < Minimum
DTC B051C 29:Left Side Assist Step Position Sensor Circuit Too Few Pulses
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