1. What is P0222?

P0222 is a Diagnostic Trouble Code indicating Throttle Position Sensor (TPS) B Circuit Low Voltage. Modern Silverado 1500 models use dual TPS sensors (A and B) for redundancy, with Sensor B acting as a secondary input to verify throttle position.

P0222 triggers when the PCM detects TPS B voltage below 0.1V (significantly lower than the normal 0.5–4.5V range). This usually indicates a fault in the sensor, wiring, or related circuits—critical for maintaining proper engine performance.

2. Common Causes in Chevrolet Silverado 1500

• Faulty TPS B Sensor – Internal resistor failure (common in 2016–2022 5.3L/6.2L models); OEM TPS assembly #12677835 recommended.
• Damaged Wiring Harness – Frayed wires or loose connections between TPS and PCM (often near throttle body bracket rubbing).
• Corroded Connectors – Moisture intrusion in TPS electrical connector causing high resistance (prevalent in off-road Silverados).
• Throttle Body Malfunction – Mechanical binding preventing TPS B from reading correctly (linked to carbon buildup).
• PCM Software Issue – Calibration errors misinterpreting voltage signals (more common in 2020–2023 models).

3. Key Symptoms

Silverado owners with P0222 report these symptoms, often worsening under heavy acceleration:

• Check Engine Light on (often paired with P0121/P0223 for related TPS issues)
• Engine hesitation or delayed throttle response
• Reduced power mode ("Limp Mode") activation
• Erratic idle (fluctuating 300–800 RPM)
• Stalling when coming to a stop
• Poor fuel economy (2–3 MPG decrease)

4. Diagnostic Steps with MA200 V6

The MA200 V6 simplifies P0222 diagnosis by isolating sensor vs. circuit issues:

• 1. Full System Scan: Connect to OBD-II port to confirm P0222 and check for related TPS codes.
• 2. Live Voltage Monitoring: Compare TPS A and B voltages—normal readings should mirror each other (0.5–4.5V). Persistent low voltage on B = fault.
• 3. Circuit Resistance Test: Use MA200 V6's multimeter to check TPS B wiring (resistance should be <1Ω; higher = damage).
• 4. Sensor Activation Test: Command throttle position changes to verify TPS B response—no movement = sensor failure.
• 5. Throttle Body Adaptation: After repairs, run TPS relearn procedure to synchronize sensors.

Case Example: 2019 Silverado 6.2L with P0222 – MA200 V6 showed 0.05V on TPS B (normal A=0.5V). Resistance test found 15Ω in wiring—repairing the harness restored normal voltage.

5. Fixes & Execution

Repair strategies for Silverado 1500 P0222 based on diagnostic findings:

• Replace TPS Assembly: - Disconnect battery negative terminal. - Remove 4 bolts securing throttle body (10mm socket). - Replace entire TPS assembly (integrated with throttle body in 2019+ models). - Run MA200 V6 TPS relearn (requires 20-minute idle cycle).
• Repair Wiring/Connectors: - Cut damaged wires, splice with heat-shrink connectors. - Clean corroded pins with electrical contact cleaner; apply dielectric grease. - Secure harness with loom to prevent future rubbing against brackets.
• Clean Throttle Body: - Remove air intake, spray throttle body cleaner on plate and bore. - Wipe carbon deposits with lint-free cloth; avoid sensor contacts. - Reassemble and perform adaptation with MA200 V6.
• Update PCM Software: - Use MA200 V6 to check for calibration updates. - Install latest TCM/PCM firmware (critical for 2020–2023 Silverados). - Clear codes and test drive 20+ miles to confirm fix.

6. Repair Costs

• DIY Diagnosis with MA200 V6: $0 (avoids $90–$160 dealer fee)
• OEM TPS Assembly: $150–$300 (part) + $120–$200 (professional labor)
• Wiring/Connector Repair: $20–$60 (parts) + $80–$150 (labor)
• Throttle Body Cleaning: $15–$40 (cleaner) + $70–$130 (service)
• PCM Reprogramming: $0 (via MA200 V6) vs. $150–$250 (dealer)
• Total Professional Repair: $200–$500 (varies by cause)

7. Preventive Maintenance

• Inspect TPS wiring during oil changes—look for abrasion near throttle body brackets.
• Clean throttle body every 30,000 miles to prevent carbon buildup affecting sensors.
• Use MA200 V6 quarterly to monitor TPS A/B voltage synchronization.
• Apply dielectric grease to TPS connectors annually (especially in humid climates).
• Update PCM software when new calibrations are released (check via MA200 V6).
• Avoid pressure washing engine bay—water intrusion damages TPS connectors.

8. Frequently Asked Questions

9. Summary

P0222 in Chevrolet Silverado 1500 indicates low voltage in Throttle Position Sensor B circuit, caused by faulty sensors, wiring damage, corrosion, or software issues. Symptoms include hesitation, limp mode, and poor fuel economy.

The MA200 V6 diagnostic tool streamlines repairs by isolating root causes and enabling TPS synchronization. Prompt fixes prevent engine damage, while regular maintenance (wiring checks, throttle cleaning) avoids recurrence.