P1293: High Side Open Bank 1 (Right)
The P1293 code indicates an open circuit in the high side driver for the fuel injectors or ignition coils on Bank 1 (right side of the engine). This typically means the power supply to these components is interrupted, often due to a faulty driver module, wiring issue, or a blown fuse. The high side driver is responsible for switching power to the injectors or coils; an open circuit prevents them from operating, causing misfires and poor engine performance.
1. Symptoms You Will Notice
- Engine misfire on Bank 1
- Rough idle or hesitation
- Check Engine Light illuminated
- Possible no-start condition
2. Most Common Causes
- Faulty cylinder head temperature (CHT) sensor (internal drift, open or short circuit)
- Damaged, corroded, or shorted CHT sensor wiring or connector (short to ground or battery voltage)
- Coolant leak or low coolant level causing erratic metal temperature readings
- Defective PCM (rare, internal 5V reference or A/D converter failure)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Inspect fuses for injector/coil power supply; replace if blown.
Step 3: Visually inspect wiring and connectors for damage, corrosion, or looseness.
Step 4: Test for voltage at the injector/coil power supply wire with key on; if no voltage, trace back to the high side driver.
Step 5: Check resistance of the high side driver circuit; compare to specifications.
Step 6: If wiring and fuses are good, suspect a faulty PCM or driver module; perform a driver module test if possible.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P1293 can cause engine misfires, reduced power, and potential damage to the catalytic converter. It is best to have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause. A blown fuse is cheap, while a faulty PCM can be more expensive.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.