P1403 VVT Solenoid B Circuit High Input
The P1403 code indicates that the powertrain control module (PCM) has detected an excessively high voltage or signal on the control circuit of the variable valve timing (VVT) solenoid 'B'. This typically points to an open circuit or a short-to-voltage condition, preventing the PCM from properly actuating the VVT solenoid. As a result, variable valve timing is compromised, which can negatively affect engine performance, fuel economy, and emissions.
01. Most Common Causes
- Faulty VVT solenoid 'B' with an internally open coil
- Short-to-voltage in the control circuit wiring
- Loose, corroded, or bent terminals in the solenoid or PCM connector
- Poor ground connection for the VVT solenoid
- Internal PCM failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or poor acceleration
- Rough idle or engine hesitation
- Decreased fuel economy
- Possible engine stalling
03. Step-by-Step Diagnosis
Scan for additional codes and freeze frame data
Visually inspect the VVT solenoid 'B' connector and wiring for damage, corrosion, or loose connections
Test the VVT solenoid resistance with a multimeter and compare to manufacturer specifications
Check for voltage at the solenoid control circuit with the ignition on; if voltage is present when it shouldn't be, suspect a short-to-voltage
Perform a continuity test on the ground circuit
If all else checks out, consider a PCM fault and perform a PCM reflash or replacement as a last resort
1. Frequently Asked Questions
Is it safe to drive?▼
You can drive short distances, but the vehicle may experience reduced performance and fuel economy. It's best to diagnose and repair the issue promptly to avoid potential engine damage.
How much does it cost to fix?▼
Repair costs vary widely: a new VVT solenoid can cost $50–$200, plus labor ($100–$200). Wiring repairs are typically $100–$300. PCM replacement can exceed $500–$1,000.