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 there is a problem with the car's system that controls how much the engine speeds up when you press the gas pedal.
The P1691 code is triggered when the Electronic Throttle Control (ETC) system detects an issue with its ability to control the engine speed properly.
The Electronic Throttle Control system uses sensors and a motorized throttle body to control the engine's air intake. This code indicates that the ETC has detected a malfunction in its ability to limit engine speed, which might be due to a fault in the throttle body, sensors, or related wiring.
• Engine may not accelerate properly
• Check Engine Light is on
• Reduced engine performance
• Faulty throttle body
• Malfunctioning throttle position sensor
• Wiring issues or poor electrical connections
Throttle Body: A component of the air intake system that controls the amount of air flowing into the engine.
Electronic Throttle Control: A system that uses electronic signals to control the throttle position.
• Use an OBD-II scanner to confirm the code.
• Inspect the throttle body and sensors for damage or dirt.
• Check the wiring and connectors for any signs of wear or corrosion.
• Clean or replace the throttle body.
• Replace the throttle position sensor if faulty.
• Repair or replace damaged wiring or connectors.
• OBD-II scanner
• Multimeter
• Screwdrivers
$150 - $500
Moderate
• Chrysler
• Dodge
• Jeep
• Regular maintenance of the throttle body.
• Ensure electrical connections are secure.
• Use high-quality fuel to prevent deposits.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional.
• Avoid driving at high speeds until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on throttle body components.
This code has been associated with issues in vehicles with electronic throttle control systems, particularly in models from the early 2000s.
Moderate – It is important to address this issue to prevent further engine performance problems.
Driving with a malfunctioning throttle control system can be unsafe and may lead to further damage.
• Engine running
• Vehicle stationary
The throttle body is typically located between the air filter and the intake manifold.
Q: Can I drive with a P1691 code?
A: It's not recommended to drive with this code as it can lead to reduced engine performance and safety issues.
Q: How do I reset the P1691 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
Budget · Bluetooth scanner
An app-based scanner with repair reports and enhanced system diagnostics on supported vehicles.
Helpful when live data and repair-report guidance can narrow down a drivability issue.
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Specialty · Fuel pressure tester
Helpful for no-start, lean, rich, injector, and fuel-delivery diagnosis.
Useful for checking whether fuel delivery is contributing to the fault.
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Specialty · Compression tester
Useful when misfire, mechanical condition, or low-cylinder-pressure problems are suspected.
Helpful when you need to rule out low compression or mechanical engine problems.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
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.