P1650

Code

CADILLAC P — Powertrain

Driver 2 Input High Voltage

Brand: CADILLAC

Type: P — Powertrain

Views: UK: 45 EN: 58 RU: 51

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Page language: EN

Short to battery voltage on the Driver 2 circuit (wiring damaged or pin contacting battery supply)
Corroded or loose connector at component or module causing intermittent high voltage reading
Faulty component/actuator on the Driver 2 circuit (internal short to B+)
Faulty or damaged control module (ECM/BCM) driver transistor or input sensing circuitry
Aftermarket accessories improperly connected to the circuit
Poor or missing ground affecting voltage sensing

Malfunction Indicator Lamp (MIL) illuminated and P1650 stored
Related device controlled by Driver 2 may not operate correctly (no function, stuck on, or intermittent)
Blown fuse for the circuit in some cases
Other electrical oddities or multiple related DTCs if the short affects other circuits

Retrieve freeze frame and freeze data; note ignition state and any other stored codes
Visually inspect wiring, connectors, and device for damage, corrosion or aftermarket taps on the Driver 2 circuit
Check fuses and fusible links related to the circuit
Backprobe the Driver 2 harness at the module and at the controlled device while key is ON and engine OFF
Confirm presence and condition of chassis and battery grounds in that area

Normal: Driver 2 circuit when OFF ≈ 0 V (low) and when ON ≈ vehicle battery voltage (~11–14.5 V) depending on state
Fault condition: voltage measured on Driver 2 circuit higher than expected when driver is commanded OFF or voltage above normal supply (indicates short to B+ or sensing fault)
Use scope to observe switching waveform when module commands the driver (clean switch between ~0 V and battery voltage)

Read and record DTCs and freeze frame. Check for other related codes that narrow the affected circuit.
Perform a visual inspection of harness, connectors, and the controlled device for damage, corrosion, pins pushed out or exposed conductors.
Check fuses and power distribution for the circuit. Replace any blown fuses only after finding cause of over-voltage.
With key ON (engine off), backprobe the Driver 2 signal at the module and at the actuator connector. Observe voltage with the actuator connected and then disconnected.
Command the Driver 2 circuit ON/OFF with a scan tool while monitoring voltage. Use a lab scope if available to view switching behavior and noise.
If high voltage is present with the actuator disconnected and no B+ sources tied to the circuit, the module driver or input sensing is likely faulty — confirm by measuring resistance from circuit to battery positive (checking for short) and to ground.
Check for aftermarket accessories or repairs that may have tied into the circuit; remove/disconnect them and retest.
Inspect and test ground points related to the module and controlled device; clean and secure as needed.
If all wiring and the actuator test good and the fault persists, follow OEM procedures for module repair or replacement. Reprogram or configure replacement module per factory instructions.
Clear codes and road/test to confirm repair; verify no reoccurrence and proper operation of the controlled device.

Wiring short to B+ between module and controlled device
Water intrusion/corrosion at connector causing high resistance and unexpected voltage
Failed actuator that has internal short to battery
Module internal driver failure

⚠️ Status

Driver 2 input voltage above allowable threshold detected; fault logged and MIL may be set.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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