P0222 – Throttle position sensor 2 input low

Last updated: March 29, 2026

DTC P0222 is an ISO/SAE controlled, General powertrain code that indicates the engine control module (ECM/PCM) has detected a problem specifically described as Throttle position sensor 2 input low. In practical terms, the module is seeing the second throttle position sensor signal lower than the acceptable range for the current operating conditions, so it may no longer trust throttle position feedback. Because throttle position data is used to manage airflow, torque, and drivability, the vehicle may respond by limiting throttle control to maintain safety. This code is best approached as a signal/circuit accuracy issue: confirm the low input on scan data, then verify reference voltage, ground integrity, and signal wiring before deciding whether a component is at fault.

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P0222 Quick Answer

P0222 means the ECM/PCM is detecting Throttle position sensor 2 input low. Check the throttle body connector and harness first, then verify the sensor’s reference voltage, ground, and the TP sensor 2 signal circuit for shorts, opens, or excessive resistance.

What Does P0222 Mean?

P0222 is set when the control module determines that the throttle position sensor 2 input is too low compared to what is expected. “Input low” refers to the electrical signal level (typically voltage or a calculated percentage derived from voltage) from throttle position sensor 2 falling below a calibrated threshold for a certain time or under certain operating conditions.

When this happens, the module may treat the throttle position information as unreliable. Depending on the strategy, it can reduce throttle authority, limit torque, or enter a reduced-power mode to prevent unintended throttle behavior and to keep control logic within safe limits.

Theory of Operation

Electronic throttle control systems typically use redundant throttle position sensing so the module can validate throttle position. The ECM/PCM supplies a regulated reference voltage and a sensor ground, then monitors one or more signal returns that change as the throttle plate moves. Throttle position sensor 2 is one of these monitored inputs.

P0222 sets when the module sees throttle position sensor 2 reporting a value that is too low to be plausible for the operating condition or compared to expected ranges. A true low input can result from a short to ground, an open in the reference or signal circuit, excessive resistance at terminals or splices, or an internal sensor issue that prevents the signal from rising appropriately as the throttle moves.

Symptoms

• Check engine light (MIL) illuminated
• Reduced engine power and/or reduced-throttle mode
• Sluggish or delayed throttle response
• Hesitation on acceleration
• Unstable idle or stalling (in some cases)
• Live data showing throttle position sensor 2 reading unusually low, stuck low, or not correlating with other throttle position data during a smooth throttle sweep

Common Causes

• Throttle position sensor 2 signal circuit shorted to ground
• Open circuit in the throttle position sensor 2 signal circuit
• Excessive resistance in the signal circuit due to corrosion, damaged wiring, or poor terminal tension
• Missing or unstable sensor reference voltage to the throttle position sensor circuits
• Poor sensor ground (low reference) at the throttle position sensor circuits
• Connector issues at the throttle body (backed-out terminals, corrosion, water intrusion, loose connector lock)
• Internal fault affecting throttle position sensor 2 output (when power/ground/signal circuits test good)
• ECM/PCM input circuit fault (after all external circuit and sensor checks are proven good)

Diagnosis Steps

Tools needed: scan tool with live data and freeze-frame access, digital volt/ohm meter (DVOM), wiring diagram for the throttle position sensor circuits, and back-probing or pin-probing tools to avoid damaging terminals.

1. Confirm the code and capture data: Verify P0222 is present (stored or pending). Record freeze-frame information, including engine speed, throttle angle data, battery voltage, and any reduced-power indicators.
2. Check for related codes: Note any additional throttle position, accelerator pedal position, throttle actuator, reference voltage, or low-reference/ground-related DTCs. Address shared power/ground/reference issues first if multiple sensors are affected.
3. Perform a careful visual inspection: Inspect the throttle body area and harness routing for chafing, pinched wiring, heat damage, prior repairs, or contact with brackets. Verify the connector is fully seated and locked.
4. Inspect connector condition: With ignition off, disconnect the throttle body connector and inspect terminals for corrosion, moisture, bent pins, spread terminals, or evidence of poor terminal tension. Correct any clear connector/terminal problems.
5. Verify reference voltage and ground: Key on, engine off. Back-probe the connector to confirm the correct reference voltage and a solid low reference (sensor ground). If reference voltage is missing, trace the reference circuit using the wiring diagram and check for shorts or opens.
6. Check the TP sensor 2 signal level: Using scan data and/or DVOM, evaluate the throttle position sensor 2 signal. Look for an implausibly low value at closed throttle and during a slow throttle sweep.
7. Wiggle test for intermittents: While monitoring the TP sensor 2 signal on the scan tool (or DVOM), gently wiggle the harness and connector near the throttle body and along common rub points. A sudden drop toward low input indicates a wiring/terminal issue.
8. Test for shorts to ground: With the connector unplugged (and following the wiring diagram), check the TP sensor 2 signal circuit for an unwanted short to ground. If present, isolate the damaged section of harness or terminal source.
9. Check for opens/high resistance: Perform continuity and resistance checks on the TP sensor 2 signal circuit from the sensor connector to the ECM/PCM connector (per wiring diagram). If continuity exists, use voltage-drop testing under operating conditions to detect high resistance that an ohmmeter may miss.
10. Verify repair and recheck correlation: After repairs, clear codes and perform a controlled throttle sweep while monitoring throttle position sensor 2. Confirm the signal is no longer low and that P0222 does not return after the appropriate drive cycle/enable conditions.

Professional tip: Don’t rely on continuity checks alone for P0222. A circuit can show continuity but still produce a low input under load due to terminal tension problems or corrosion. Verify reference voltage and low reference integrity first, then confirm the TP sensor 2 signal stays stable during a slow throttle sweep and a harness wiggle test.

Possible Fixes

• Repair damaged wiring (chafing, pinched sections, melted insulation) in the throttle position sensor 2 circuits
• Repair a short to ground in the throttle position sensor 2 signal circuit
• Repair an open or high-resistance connection in the signal, reference, or low-reference circuits
• Clean/dry connectors and correct terminal fit issues (corrosion, backed-out terminals, poor pin tension)
• Replace the throttle position sensing component only after confirming correct reference voltage and ground and proving the signal remains low
• Address an ECM/PCM circuit issue only after all external wiring and sensor checks are verified

Can I Still Drive With P0222?

Driving with P0222 may be possible, but it can lead to reduced power or limited throttle response because the ECM/PCM is detecting throttle position sensor 2 input low. If the vehicle enters a reduced-throttle mode, acceleration may be limited and response may be inconsistent for traffic situations. If you experience stalling, severe hesitation, or an inability to control speed predictably, do not continue driving and have the vehicle diagnosed.

How Serious Is This Code?

P0222 can be serious because throttle position feedback is critical to torque and airflow control. A persistently low throttle position sensor 2 input can cause the module to limit throttle operation to protect safety, which may reduce acceleration when it is needed. While the code does not automatically indicate internal engine damage, the drivability and safety implications make timely diagnosis important.

Common Misdiagnoses

Common misdiagnoses with P0222 include replacing parts before confirming the electrical fault that causes a low input. Skipping reference voltage and sensor ground tests can lead to missing a shared power/ground issue. Another frequent mistake is judging the system by a single data parameter rather than confirming throttle position sensor 2 behavior across the full throttle sweep and under harness movement, which can hide intermittent wiring or terminal problems.

Most Likely Fix

The most likely fix is correcting an electrical issue that makes throttle position sensor 2 input low, such as a poor connector connection, damaged wiring, or a short/open/high-resistance condition in the TP sensor 2 signal, reference, or ground circuit. Once circuits are confirmed correct, a component fault affecting the throttle position sensor 2 output becomes the next step to evaluate.

Repair Costs

Repair cost depends on whether the confirmed root cause is a sensor, wiring, connector issue, or control module problem. Verify the fault electrically before replacing parts.