Code
P1641
DAEWOO
P — Powertrain
Vi motor coil 2 open/short
Views:
UK: 4
EN: 11
RU: 4
AI status
Completed
Completed
100%
Causes
- Open circuit in coil 2 (internal break)
- Short circuit in coil 2 (short to ground or battery)
- Damaged or corroded connector or terminals at the motor
- Broken, chafed or pinched wiring between motor and ECU
- Poor or missing ground or supply voltage to the motor
- Faulty ECU/driver output for coil 2
Symptoms
- Check Engine MIL illuminated
- Related actuator function poor or non‑functional (depends on motor purpose)
- Rough idle, stalling or drivability issues if motor affects idle or intake
- Stored or intermittent fault for coil 2
What to check
- Read and record freeze‑frame and live data with a scan tool; confirm P1641 is current/repeatable
- Visual inspection of motor connector and wiring for corrosion, bent pins, heat damage, or chafing
- Measure coil resistance across the motor coil 2 terminals with multimeter
- Check for supply voltage at the motor connector with ignition ON (backprobe)
- Check for good ground at the motor ground circuit
- Inspect wiring continuity between motor connector and ECU connector
Signal parameters
- Coil continuity: measurable low resistance across coil terminals (a few ohms typical); infinite resistance indicates open
- Short condition: near 0 ohms to ground or battery indicates short
- Supply: battery voltage present at power feed terminal with ignition ON
- Control: ECU typically provides PWM/ground switching to drive the coil — presence of switching signal while cranking/running indicates ECU command
- No switching and correct supply/ground may indicate ECU driver fault
Diagnostic algorithm
- Use a scan tool to verify P1641, note freeze frame and whether the fault is current or historical. Clear codes and try to reproduce.
- Visually inspect the Vi motor connector and wiring for corrosion, pin damage, melted insulation, or loose terminals. Repair any obvious damage.
- With connector disconnected, measure DC resistance of coil 2 at the motor terminals. An open (infinite) or short to ground/battery indicates internal motor failure — replace motor if confirmed.
- With ignition ON, backprobe the motor connector to confirm presence of battery feed and good ground reference. Lack of supply or ground requires tracing and repair of power/ground circuits.
- If supply and ground are present, reconnect and monitor the control signal while cranking/running (use oscilloscope or duty‑cycle capable scope tool). Confirm ECU is commanding coil 2.
- Check continuity between the motor connector and the ECU connector for the coil 2 circuits. Repair any opens or shorts found (splice, replace harness, fix terminal).
- If wiring and motor check good but code remains, test/replace the Vi motor. If a new motor still sets P1641 and wiring is good, suspect ECU driver failure and consult wiring diagrams and manufacturer repair procedures before replacing ECU.
- After repairs, clear codes and perform road/operational test to verify fault does not return.
Likely causes
- Internal coil failure in Vi motor (most common)
- Connector terminal corrosion or poor contact at the motor
- Wiring harness damage (open or short to body/chassis)
- ECU driver transistor failure (less common)
Fault status
Status
Vi motor coil 2 open/short detected — electrical fault in coil 2 circuit of the Vi motor. Inspect wiring, connector, motor coil, and ECU driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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