Code
P1656
SATURN
P — Powertrain
Driver 2 Line 6
Views:
UK: 27
EN: 57
RU: 35
AI status
Completed
Completed
100%
Causes
- Open or short in the wiring for the driver 2 line 6 circuit
- Corroded, loose, or damaged connector at the load or module
- Faulty load (actuator, solenoid, relay, valve, etc.) connected to the driver
- Blown fuse or poor power/ground feed to the circuit
- Faulty body/control module output driver or internal module failure
- Software or calibration issue in the module
Symptoms
- Malfunction or inoperative component controlled by Driver 2 Line 6
- MIL (Check Engine/Service engine soon) lamp illuminated
- Intermittent operation of the affected device
- Possible blown fuse for the circuit
- Related system warnings or reduced functionality
What to check
- Read freeze frame and confirm P1656 is current and not historical; note other stored codes
- Identify which physical component/relay corresponds to Driver 2 Line 6 from factory documentation
- Visually inspect wiring, connectors, and pins for damage, corrosion, or water intrusion
- Check relevant fuses and power/ground supplies for the circuit
- Backprobe the module output with key on/engine running while commanding the device (or using active test)
- Measure resistance of the load to check for short or open
Signal parameters
- Resting voltage on driver output: typically near 0 V when not commanded (low-side driver) or near battery voltage if high-side
- Commanded state: switching to battery voltage or ground depending on driver type
- If PWM controlled: duty cycle varies when commanded; frequency depends on application (check service manual)
- Load resistance: compare measured ohms to known-good specification for the component
- Short-to-ground: output stuck near 0 V; short-to-battery: output near battery voltage when not commanded
Diagnostic algorithm
- Confirm the code: clear codes and perform test drive or reproduction steps to verify P1656 returns.
- Consult factory wiring diagrams to identify the exact circuit, connector pin, and associated component for Driver 2 Line 6.
- Perform visual inspection of wiring, connectors, and component for obvious faults; repair as needed.
- Verify power and ground feeds to the load and module; check relevant fuses and fusible links.
- With a multimeter, backprobe the module output while commanding the circuit (use scan tool active test if available). Observe voltage/logic state.
- Measure load resistance at the connector with the harness disconnected. Compare to specification to detect short or open.
- If output shows abnormal voltage but load is good, suspect module driver failure. Verify by disconnecting load and measuring open-circuit behavior per service manual.
- Use an oscilloscope if intermittent PWM or waveform diagnosis is needed to identify switching anomalies or noise.
- Repair wiring or replace the faulty component. If wiring and load verify OK and fault persists, consider module replacement or reprogramming per factory procedures.
- After repairs, clear codes and retest to confirm the fault does not return.
Likely causes
- Damaged harness between module and component (open or short to ground/battery)
- Failed actuator or accessory on that circuit (stuck, low resistance, shorted)
- Corroded or pushed-back terminal in the connector
- Failed output transistor inside the control module
Fault status
Status
Driver 2 Line 6 - Output circuit fault detected (open/short/intermittent). Module has flagged abnormal behavior on that driver output.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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