P2137: Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation

P2137 compares position signals B and C and sets when their voltages drift apart beyond the calibrated tolerance. No manufacturer publishes a detection rule for this pair; FCA merely lists P2137 in emissions recall T21 for the 2004-2006 Dodge Sprinter among the codes that may surface after the ECU is reprogrammed. Where the letters are known, B is the second track of the main throttle and C a sensor on a second throttle body (GM 23OBDG07). The neighbouring pair A/C is documented by Mercedes on the M177 V8, where corroded or high-resistance actuator pins set it, which is the most likely pattern here too. Unlike P2135, which stays within one throttle, this check spans two components. Expect a warning lamp and possibly reduced power.

Symptoms

• Engine warning lamp on
• Possible loss of power

Most likely causes

• High resistance or corrosion at a throttle connector
• Track B or sensor C drifted or worn
• Fault on a shared 5 V reference or ground

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pedal and throttle connectors
2. Compare both signals at the same time in live data and check any recent installation work.
3. Use live data to confirm that both sensors rise smoothly and consistently
4. Clean the throttle if it has carbon buildup
5. Run the relearn procedure with the scanner if the manufacturer requires it
6. Replace the part identified by the diagnosis

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2137 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 1: Air and fuel
• 37: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2137?

Be careful: the car may suddenly lose power. If it goes into limp mode, get off the highway and calmly make your way to a repair shop.

What causes code P2137?

The most common causes are: high resistance or corrosion at a throttle connector; track B or sensor C drifted or worn; fault on a shared 5 V reference or ground.

Related codes

• P2135Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
• P2136Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation
• P2AD2Throttle/Pedal Position Sensor/Switch B/G Voltage Correlation
• P0221Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance

Sources

• static.nhtsa.gov: MC 10190682 9999
• static.nhtsa.gov: MC 11036076 0001
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.