21NA283
Service Bulletin Details
Public Details for: 21NA283
Models from 2022
2022 CHEVROLET CORVETTE |
Models from 2021
2021 CHEVROLET CORVETTE |
Models from 2020
2020 CHEVROLET CORVETTE |
Bulletin No.: Service Bulletin Date: 21-NA-283 December, 2021 TECHNICAL Subject: Service Front Suspension Lift System Message Displayed on Driver Information Center (DIC) – DTC C103C and/or C103E Symptom 64 Set This bulletin replaces PIC6434A. Please discard PIC6434A. Brand: Model: Chevrolet Corvette Model Year: VIN: from to from to 2020 2022 All All Engine: Transmission: All All Involved Region or Country North America, Europe, Middle East, Japan, Australia/New Zealand Additional Options (RPO) Front Suspension Lift System (RPO E60) Condition Some customers may comment that they have seen a Service Front Lift System message displayed on the DIC. Technicians may find one or more of the following DTCs set: • C103C: Left Front Strut Position Sensor Signal • C103E: Left Front Strut Position Sensor Signal • Symptom 64: Signal Plausibility Failure (This sub type is used for failures where the control module detects a single input parameter is operating outside the plausible range.) Cause Note: If there is low mileage on the vehicle or previous service work on this system has been identified, it is possible that air entrapment in the system may be the causing this issue. This condition may be caused by air entrapment in the lift system. Attempt to operate the front lift system several times. Determine if the codes will reset or if the system will raise briefly and then sink back down. If this occurs, that may indicate that there is indeed air trapped within the front suspension lift system. Follow the published information in SI for these DTCs, paying particularly close attention to "Test B" at the end of the flowchart: Correction Copyright 2021 General Motors LLC. All Rights Reserved. ⇒ First perform the Prime Front Suspension Pump procedure with the scan tool five times in an attempt to purge any trapped air bubbles from the system. ⇒ Next, raise and lower the front suspension system through 10 complete cycles. If the DTCs reset, perform the Front Hydraulic Suspension Bleed procedure and re-evaluate the concern. As a way to double check the system, a technician can measure the distance between the floor and the lower portion of the vehicle's front fascia. A correctly operating vehicle should reach a front fascia height of at least 35 mm within 4 seconds of pump operation. Page 2 December, 2021 Bulletin No.: 21-NA-283 Warranty Information For vehicles repaired under warranty, use: Labor Operation 8020652 Description Labor Time Front Hydraulic Suspension Bleeding Use Published Labor Operation Time Version 1 Modified Released December 06, 2021 GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION