Worn or dirty throttle position sensor internal contacts causing intermittent signal dropouts; Corroded, loose, or damaged electrical connector at the TP sensor; Chafed or broken wires in the TP sensor circuit, especially near the throttle body or harness bends; Poor ground connection for the TP sensor or PCM; Failed TP sensor (complete or partial failure); PCM internal fault (rare, but possible after other causes are ruled out)

DTC codes / Chrysler codes / P1122

P1122 · ChryslerTP Sensor Circuit Intermittent Low Voltage

Q: What does code P1122 mean?

TP Sensor Circuit Intermittent Low Voltage. P1122 on a Chrysler vehicle means the powertrain control module (PCM) has detected an intermittent low-voltage condition on the Throttle Position (TP) sensor circuit. The PCM monitors the TP sensor signal and sees it momentarily drop below the expected minimum voltage, often during a specific driving condition such as acceleration or idle. This intermittent glitch can cause drivability issues and may trigger the check engine light.

P1122 on a Chrysler vehicle means the powertrain control module (PCM) has detected an intermittent low-voltage condition on the Throttle Position (TP) sensor circuit. The PCM monitors the TP sensor signal and sees it momentarily drop below the expected minimum voltage, often during a specific driving condition such as acceleration or idle. This intermittent glitch can cause drivability issues and may trigger the check engine light.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Check engine light illuminated, often with no other noticeable symptoms
Intermittent hesitation or stumble during acceleration
Unstable or fluctuating idle speed
Brief loss of power or surging while cruising
Transmission may shift erratically or feel like it is slipping due to incorrect throttle input

Common causes, most likely first

Worn or dirty throttle position sensor internal contacts causing intermittent signal dropouts
Corroded, loose, or damaged electrical connector at the TP sensor
Chafed or broken wires in the TP sensor circuit, especially near the throttle body or harness bends
Poor ground connection for the TP sensor or PCM
Failed TP sensor (complete or partial failure)
PCM internal fault (rare, but possible after other causes are ruled out)

How to diagnose and fix it

Inspect the TP sensor connector and wiring for corrosion, looseness, or damage; clean and repair as needed
Check the TP sensor ground circuit for excessive resistance and repair any poor ground
Backprobe the TP sensor signal wire and monitor voltage with a scan tool or multimeter while wiggling the harness to catch intermittent drops
Perform a throttle position sensor sweep test with a scan tool to verify smooth voltage change through the entire range
Replace the TP sensor if it shows dead spots or intermittent voltage drops during the sweep test
If the sensor and wiring are good, check for PCM software updates or a faulty PCM as a last resort

Intermittent TP Sensor Faults Are Tricky

A dirty throttle body or carbon buildup can cause the TP sensor to report erratic voltages, mimicking a sensor failure; cleaning the throttle body often resolves the issue.
Intermittent low voltage can be caused by a poor ground at the throttle body or engine block, not just the sensor itself; always verify ground integrity before replacing parts.
The TP sensor signal can be affected by a failing accelerator pedal position sensor on drive-by-wire systems, so check both if the code persists.
A scan tool with graphing capability is essential to catch the intermittent glitch; a simple code reader may not show the momentary voltage drop.
Replacing the TP sensor without addressing worn throttle shaft bushings can lead to a repeat failure, as the shaft play can damage the new sensor.

Can I keep driving with P1122?

You can usually drive the vehicle with this code, but be prepared for occasional hesitation or stalling, especially during acceleration. Avoid aggressive driving or towing until the fault is repaired, as the intermittent signal can cause unpredictable engine behavior.

Tools that help

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Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.