P1297 - High Sides Shorted Together
This diagnostic trouble code indicates that two or more high-side driver circuits in the engine control module (ECM) or powertrain control module (PCM) are shorted together. High-side drivers control power to various actuators such as fuel injectors, ignition coils, or solenoids. A short between these circuits can cause multiple components to malfunction simultaneously, leading to drivability issues and potential damage to the ECM/PCM.
01. Most Common Causes
- Short circuit between two high-side driver wires in the engine harness
- Faulty ECM/PCM with internal short
- Corroded or damaged connectors at ECM or actuators
- Water intrusion into ECM or harness connectors
02. Symptoms You Will Notice
- Engine misfire or rough running
- Check Engine Light illuminated
- Multiple actuators not working (e.g., injectors, coils)
- Engine may not start or stalls
03. Step-by-Step Diagnosis
Step 1: Scan for all codes and freeze frame data to identify affected circuits.
Step 2: Visually inspect engine harness for chafed, melted, or pinched wires, especially near hot or moving parts.
Step 3: Disconnect ECM and measure resistance between suspect high-side driver pins; a low resistance indicates a short.
Step 4: If harness is good, test ECM by swapping with known good unit or performing manufacturer-specific tests.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P1297 can cause further damage to the ECM or actuators and may lead to stalling or no-start conditions. It is recommended to have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs vary from $150 to $400 depending on the cause. If it's a simple wiring repair, it may be on the lower end. ECM replacement can cost $300-$400 or more.