P1299: Bank 2 Injector High Side Open
The P1299 code indicates an open circuit on the high side of the fuel injector driver for engine bank 2, along with the engine failing to reach target idle speed. The high side refers to the power supply control to the injector, typically managed by the PCM via a high-impedance driver. The 'target idle not reached' condition means the engine cannot maintain or achieve the programmed idle RPM due to lack of fuel in one or more cylinders on bank 2, causing instability or stalling. This code is specific to Ford injector control architecture, where the PCM monitors injector circuit current and detects an absence of expected inductive load.
01. Most Common Causes
- Faulty fuel injector or internal open circuit on bank 2
- Open wiring or corrosion in the injector high-side control circuit (bank 2)
- Injector connector disconnected, damaged, or with corroded pins
- Failed PCM high-side driver
- Blown injector power fuse or relay, or excessive resistance in the bank 2 injector power circuit
- Failed injector control module (on applications with a separate module)
- Poor ground connection in the bank 2 injector circuit
02. Symptoms You Will Notice
- Engine idle is rough or unstable
- Engine stalls or fails to start
- Check Engine Light illuminated
- Reduced engine performance and possible misfire on bank 2
03. Step-by-Step Diagnosis
Scan for codes and verify P1299 is present; check freeze frame data.
Visually inspect bank 2 injector connectors and wiring for damage, corrosion, or disconnection.
Test injector resistance on bank 2; compare to specifications (typically 12-16 ohms).
Check for battery voltage at the injector high-side circuit with key on; if missing, inspect fuses and relays.
Use a noid light or oscilloscope to verify injector pulse from PCM; if no pulse, suspect PCM driver failure.
Perform a voltage drop test on the injector ground circuit to rule out poor ground.
1. Frequently Asked Questions
Is it safe to drive?▼
No, driving with P1299 is not recommended. The engine may stall or run poorly, leading to unsafe driving conditions and potential damage to the catalytic converter.
How much does it cost to fix?▼
Repair costs vary widely: a simple injector connector repair may cost $50-$150, while replacing a fuel injector runs $200-$400 per injector. If the PCM needs replacement, expect $500-$1,200 including programming.