🚨 Diagnostic Profile
Vehicle Make: Chrysler
Description: Throttle Body Service Required. Electronic throttle control (ETC) system flagged for service, which may involve throttle body cleaning, relearn procedure, or component replacement. Applicable across Chrysler/Dodge/Jeep/RAM platforms utilizing electronic throttle control (drive-by-wire) systems, typically flagging codes in the P0120-P0124 (TPS circuit), P2101-P2110 (throttle actuator control), or P0505/P0506/P0507 (idle control) ranges. Exact model year, engine, and DTC confirmation should be verified against the vehicle’s specific scan data before proceeding.
🚨 Repair Difficulty Tier
Tier: Intermediate
Throttle body cleaning and throttle adaptation relearn are generally manageable with a scan tool and basic hand tools. Replacement, wiring verification, or ETC fault diagnosis involving the Powertrain Control Module (PCM) may require advanced diagnostic equipment and should be escalated to a Professional Only tier if the fault persists after service or if PCM-level throttle body authentication/configuration is required.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
- Verify battery voltage reads approximately 12.4V-12.6V with engine off, and 13.5V-14.7V with the engine running at idle, using a digital multimeter at the battery terminals.
- Inspect throttle body housing, bore, and blade for carbon buildup, oil residue (common on PCV-fed intake designs), debris, or physical damage to the throttle blade and shaft.
- Check the throttle body electrical connector for corrosion, bent pins, or loose seating at the connector housing mounted directly on the throttle body assembly; inspect the connector locking tab for full engagement.
- Inspect air intake ducting, boots, and clamps between the air filter housing and throttle body inlet for leaks, cracks, or loose clamps that could cause unmetered air entry.
- Review freeze frame data and all stored/pending DTCs with a compatible OBD-II scan tool before performing any cleaning or reset procedures, and document mileage/conditions present at fault setting.
Step 2: Diagnostic Verification
- Scan for active and pending DTCs related to throttle position (TPS), throttle actuator control (TAC), and idle air control (IAC) systems; note any correlating codes for the Accelerator Pedal Position (APP) sensor.
- Using a bi-directional scan tool, command the throttle body motor to open and close through its full range and observe real-time throttle position sensor response on the data stream for smooth, linear movement without hesitation or dead spots.
- Compare throttle position sensor signal voltages against a known-good baseline: dual TPS signals should move inversely and proportionally to one another across the throttle sweep, with no dropouts, using live data PIDs rather than assumed fixed voltage values, since exact calibration varies by model year and engine application.
- Verify accelerator pedal position sensor signal correlates proportionally with commanded and actual throttle plate position in live data; a mismatch points toward APP sensor or wiring faults rather than the throttle body itself.
- Confirm reference voltage (typically 5V) and ground circuit integrity at the throttle body connector using a digital multimeter back-probed at the connector with the harness connected, verifying against a known good chassis ground.
Step 3: Resolution & Reset Process
- Clean the throttle body bore, blade, and shaft using an approved throttle body/electronic choke-safe cleaner only; avoid spraying directly into the electrical connector, motor housing, or TPS sensor area.
- Reconnect all connectors and confirm secure, fully-seated locking tabs before proceeding.
- Perform the throttle body/idle relearn procedure using a capable scan tool; on many Chrysler platforms this involves a key-on/engine-off idle relearn sequence or a documented drive cycle, as the ignition-cycle relearn method varies by model and powertrain control module calibration.
- Clear stored DTCs and perform a road test or drive cycle sufficient to allow monitors to run and confirm the fault does not return; allow idle to stabilize in Park/Neutral and under load conditions.
- If the fault persists after cleaning and relearn, replace the throttle body only after confirming wiring harness, connector, and reference voltage/ground integrity are fault-free; new throttle bodies on electronic throttle control systems typically require a PCM relearn or initialization procedure immediately after installation.
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- Approved electronic throttle body-safe cleaner (non-chlorinated, O2-sensor and throttle-safe formula)
- Replacement throttle body gasket or O-ring seal kit (if the assembly is removed from the intake manifold)
- Replacement electronic throttle body assembly (OEM or OEM-equivalent, application-specific — confirm exact part number against VIN before ordering)
- OEM-level or professional-grade bi-directional scan tool capable of performing throttle/idle relearn and TAC system diagnostics (e.g., factory-level diagnostic software or an aftermarket tool with bi-directional ETC support)
Average Component Price:
- Throttle body cleaner: approximately $8–$15 per can
- Gasket/O-ring kit: approximately $5–$20
- Replacement throttle body assembly: approximately $150–$450 for the part alone, depending on engine platform (4-cylinder vs. V6/V8/truck applications), with dealer OEM units typically priced higher than quality aftermarket equivalents
Estimated Labor Hours:
- Inspection and diagnostic verification (scan, live data review, connector/voltage checks): approximately 0.5–1.0 hour
- Throttle body cleaning, reinstallation, and relearn procedure: approximately 0.5–1.5 hours, depending on throttle body accessibility and intake routing on the specific engine
- Throttle body replacement (R&R) including relearn, if required: approximately 1.0–2.0 hours, with higher-end estimates applying to transverse V6 or truck applications where the throttle body is less accessible
- Diagnostic/programming software access fee (if using dealer-level or subscription-based professional diagnostic software): approximately $30–$150 depending on provider and subscription duration