P1294: High Side Open Bank 2 (Left)
The P1294 code indicates an open circuit in the high side driver for bank 2 (left side) of the engine. This typically affects the fuel injectors or ignition coils on that bank. The high side driver is a transistor inside the engine control module (ECM) that supplies power to these components. An open circuit means there is a break in the wiring or a failed driver, preventing proper operation of the injectors or coils on bank 2.
01. Most Common Causes
- Open or shorted wiring in the injector or coil circuit for bank 2
- Failed fuel injector or ignition coil on bank 2
- Faulty engine control module (ECM) with damaged high side driver
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle on bank 2
- Reduced engine power and poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P1294 and check for other codes.
Step 2: Visually inspect wiring and connectors for bank 2 injectors/coils for damage or corrosion.
Step 3: Measure resistance of injectors/coils on bank 2; compare to specifications.
Step 4: Test the high side driver circuit using a multimeter or oscilloscope to check for voltage output from ECM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The engine may misfire, causing poor performance and potential damage to the catalytic converter.
How much does it cost to fix?▼
Repair costs range from $50 to $150 for wiring repairs, but if the ECM needs replacement, it can be $500-$1000.