P0220: Throttle/Pedal Position Sensor/Switch "B" Circuit

What does P0220 mean?

Common causes

• A signal wire shorted to ground or to voltage, split with the throttle-body connector unplugged and the tests below
• On the 2007 G6, sensor 2 outside 0.25–4.59 volts for more than 1 second
• A shared 5-volt reference fault, which that procedure checks as P0651 before this code
• The two signal wires shorted together, which the G6 test catches as less-than-infinite resistance between terminals D and F
• The throttle body, after those G6 circuit tests pass
• The control module, only on the G6 branch where P0220 is the only throttle-position DTC after the parameter check
• A separate cable-throttle sensor, or a pedal, substituted for the part this diagram names

Symptoms

• P0220 stored
• On the G6, sensor 2 under 0.25 volt or over 4.59 volts for more than 1 second
• Reduced engine power on that procedure, and an engine-off command under the conditions it lists
• P0222, P0223, or P2135 stored with it, which takes the G6 path away from the only-P0220 module replacement
• Pedal movement that does not change the sensor 2 parameter, checked in park
• A cable-throttle sensor price applied to a sensor that is inside the throttle body

Diagnostic steps

1. 1.Confirm whether this chart's sensor B is the G6 sensor 2 in the throttle body or a pedal track. Stop if you are about to buy the other part.
2. 2.Park. If the pedal does not change engine speed, do not continue a road test.
3. 3.On the G6, if P0641 or P0651 is stored, diagnose that reference code first. Ignition on, engine off, sensor 2 should be 0.25–4.59 volts and should change with the pedal. Sensor 1 on that page is 4.75–0.35 volts. The agree parameter is the comparison. Do not force the traces to slope the same way.
4. 4.The G6 verification says that if P0120 or P0220 is the only throttle-position DTC, replace the control module. That sentence is that procedure. Do not use it on a chart that does not print it.
5. 5.Ignition off, disconnect the throttle body. Wait the 90 seconds that procedure prints. Low reference terminal C to ground should be under 5 ohms. Five-volt reference terminal E to ground, ignition on, should be 4.8–5.2 volts. Under 4.8 is a short to ground or an open. Over 5.2 is a short to voltage. Clear the wire before the module is replaced.
6. 6.With the body unplugged, sensor 2 should read over 4.8 volts. Under 4.8 volts is a short to ground on that signal, not a passing open. A reading that is already high is the bias that step expects. It is not, by itself, a short to power. The short-to-voltage or open split is the fused jumper from signal terminal F to low reference C: sensor 2 should fall under 0.1 volt. If it stays over 1.0 volt, test that signal for a short to voltage or an open.
7. 7.With the module disconnected, the G6 continuity list is under 5 ohms on the three circuits it names, and infinite resistance between signal terminals D and F. If every circuit passes, that procedure replaces the throttle body.
8. 8.Do not move the plate by hand with the ignition on. Verify in park, pedal applied, and record a road check rather than watching the tool while driving.

Repair cost

$620 – $770 (throttle body replacement, parts and labor, RepairPal national average updated 3 September 2026, for a sensor B that is inside the throttle body as on the 2007 Pontiac G6; a separate throttle-position sensor and the accelerator pedal are outside this pair; the Ford F-150 throttle-body line at $874–$931 is above this average)

RepairPal's throttle body replacement, updated 3 September 2026, averages $623–$766 (labor $132–$193, parts $492–$573), rounded to $620–$770. The Ford F-150 line on that page is $874–$931 and is above the national average. RepairPal's separate throttle-position sensor averages $185–$258 and describes a sensor opposite the throttle-cable spring. That sensor is outside the pair. The 2007 G6 repair replaces the throttle body when the circuits test normal, and it replaces the control module when P0220 is the only throttle-position DTC. The module is not in the pair. An accelerator pedal was not priced. Check-engine diagnosis is $125–$183 and is separate.

DIY vs shop

Leave this one to a qualified shop. The barrier here is manufacturer-grade tooling, training, or certification that most home setups do not have. DIY attempts often produce a more expensive problem than the original code.

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