Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer detected an attempt to start the engine while it was already running. It's like trying to turn on a light that's already on.
This error occurs when the vehicle's control module detects an attempt to engage the starter motor while the engine is already running.
The P1650 code is triggered when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects that the starter motor has been engaged while the engine is running. This can occur due to a malfunction in the ignition switch or starter relay, or a wiring issue.
• Grinding noise when attempting to start
• Starter motor engaged while engine is running
• Check Engine Light illuminated
• Faulty ignition switch
• Stuck starter relay
• Wiring issues or short circuits
ECM: Engine Control Module
PCM: Powertrain Control Module
• Check for any stored trouble codes and freeze frame data.
• Inspect the ignition switch for proper operation.
• Test the starter relay and associated wiring for shorts or faults.
• Replace the faulty ignition switch.
• Repair or replace the starter relay.
• Fix any wiring issues or short circuits.
• OBD-II scanner
• Multimeter
• Screwdriver set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect ignition components.
• Avoid holding the key in the start position too long.
• Keep the electrical system in good condition.
Engine Performance
• Do not attempt to start the car if the engine is already running.
• Have the vehicle inspected by a professional if this code appears.
Check with your vehicle manufacturer for warranty coverage on ignition and starter components.
This code has been more prevalent in vehicles with older ignition systems or those with high mileage.
Moderate – While the vehicle may still operate, ignoring this code can lead to starter motor damage.
Operating a vehicle with this issue may lead to further mechanical damage and should be addressed promptly.
• Engine running
• Attempt to engage starter motor
The ignition switch is typically located on the steering column or dashboard, while the starter relay is usually found in the fuse box under the hood.
Q: Can I drive with a P1650 code?
A: It's possible to drive, but it's not recommended as it can cause further damage to the starter motor.
Q: How do I clear a P1650 code?
A: After fixing the issue, you can clear the code with an OBD-II scanner.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.