P0703 on Chevrolet
Brake Switch B Circuit Malfunction
P0703 on Chevrolet vehicles indicates brake switch b circuit malfunction. Au7o has documented this code across 1 Chevrolet model — most commonly on Malibu. This code means the engine/transmission computer detected an out-of-range or implausible signal from the brake switch (circuit B). The brake switch tells the PCM/TCM when the brakes are applied, which affects cruise control, torque converter lockup, and certain shift and idle strategies. A faulty signal can cause issues like cruise control not working, harsh shifts, or the converter not unlocking. Typical repair costs on Chevrolet range from $30 to $180, depending on the specific model and root cause.
Common Causes of P0703
- •Faulty brake light switch
- •Misadjusted brake switch
- •Open or shorted brake switch wiring
- •Corroded or loose connector at the switch
- •Blown brake circuit fuse
- •PCM/TCM input fault
P0703 on Chevrolet by Model
Chevrolet Malibu(1 issue)
- Brake Light Switch Failure and Stoplamp Circuit Problems Causing Cruise Control and Shift Interlock Issues2004-2007
A recurring issue on 2004-2007 Malibu models is failure of the brake light switch or related stoplamp circuit components, leading to inoperative brake lights, cruise control cancellation problems, or inability to shift out of Park. Some owners also report intermittent brake lamps staying on or not illuminating consistently. Because the stoplamp signal is shared with several systems, a simple switch fault can create multiple confusing symptoms at once.
Looking for P0703 on a different make?
View P0703 across all makes →Frequently Asked Questions
What does P0703 mean on Chevrolet?▼
P0703 stands for "Brake Switch B Circuit Malfunction." This code means the engine/transmission computer detected an out-of-range or implausible signal from the brake switch (circuit B). The brake switch tells the PCM/TCM when the brakes are applied, which affects cruise control, torque converter lockup, and certain shift and idle strategies. A faulty signal can cause issues like cruise control not working, harsh shifts, or the converter not unlocking. On Chevrolet specifically, this code is documented across 1 model.
What causes P0703 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty brake light switch, Misadjusted brake switch, Open or shorted brake switch wiring, Corroded or loose connector at the switch, Blown brake circuit fuse. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0703 on a Chevrolet?▼
Repair costs on Chevrolet range from $30 to $180, depending on the specific model and root cause.
Which Chevrolet models have P0703 documented?▼
Au7o has documented P0703 on 1 Chevrolet model: Malibu.