P0617 on 2019 Jeep Cherokee: Starter Control Circuit High Causes and Fixes

What's Unique About the 2019-2019 Jeep CHEROKEE

On the 2019 Jeep Cherokee (KL platform), a P0617 code can be more than a simple starter issue. It's sometimes linked to broader electrical problems, as indicated by Technical Service Bulletin #18-020-21, which groups P0617 with an ECU internal performance code (P0607). This TSB involves a PCM software update to address a wide range of electrical DTCs, suggesting that what appears to be a starter circuit fault could originate from a software glitch or a failing PCM. Furthermore, this platform is known for grounding issues, where a corroded or broken ground strap can cause a no-start condition and trigger various electrical codes. Finally, NHTSA Safety Recall U87 / 18V-524 affects some 2019 Cherokees, where the PCM may fail due to a faulty voltage regulator, causing a no-start or stalling, which could be the root cause of a P0617 code.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Engine will not crank or start.
• An audible rapid clicking sound from the engine bay when trying to start.
• Intermittent starting issues.
• Check Engine Light is illuminated on the dashboard.
• Continuous cranking even after the key is released (rare).

Most Likely Causes

1. Faulty Starter Relay 🔴 High Probability Relays are electromechanical switches that can fail over time. The internal contacts can weld together or the internal coil can short, causing a high voltage reading in the control circuit. This is a common failure point across many vehicles.
   How to confirm: The starter relays (K1 and K3) are in the under-hood fuse box (Power Distribution Center). A common diagnostic step is to swap a suspect relay with an identical one from a non-critical circuit (like the horn or blower motor) to see if the problem is resolved. If the car starts, the relay is bad.
   Typical fix: Replace the faulty starter relay. The Mopar OEM part number is 56029616AA.
   Est. part cost: $15-$40
2. Poor Ground Connection 🟡 Medium Probability Jeep platforms have documented cases of starting and electrical issues caused by faulty or broken ground cables. A bad ground can cause voltage to flow through incorrect paths, leading to high circuit readings and no-start conditions.
   How to confirm: Visually inspect the main battery ground cable and the engine/transmission ground straps for tightness, corrosion, or breaks. On the Cherokee, a key ground strap runs from the powertrain control module area to the front rail. Perform a voltage drop test on the ground circuit to confirm its integrity. A reading of more than a few hundred millivolts indicates a problem.
   Typical fix: Clean the grounding points to bare metal or replace the faulty ground cable/strap. The Mopar part number for a common 🎬 Watch: How to check your grounds for electrical problems ground strap on this platform is 68371295AB.
   Est. part cost: $20-$75
3. Wiring Short or Damaged Connector 🟡 Medium Probability The wiring harness to the starter or relay can become damaged from heat, vibration, or corrosion, causing a short to a power source. The signal wire on the starter solenoid 🎬 See this guide on diagnosing common no-crank starting issues is a common point of failure.
   How to confirm: Visually inspect the wiring harness between the PCM, the starter relay, and the starter solenoid for any signs of chafing, melting, or corrosion. Use a multimeter to check for voltage on the starter relay control circuit wire (PCM Connector C2, Pin 29) with the key off. If voltage is present, there is a short to a power source in the harness or a faulty PCM driver.
   Typical fix: Repair or replace the damaged section of the wiring harness or the connector.
   Est. part cost: $5-$50 for repair, $200-$600 for harness replacement
4. Faulty Powertrain Control Module (PCM) ⚪ Low Probability The internal driver circuit within the PCM that controls the starter relay can fail, causing it to send continuous or incorrect voltage. This is often seen with other codes like P0607 (Control Module Performance), which is specifically mentioned alongside P0617 in TSB 18-020-21 for the 2019 Cherokee. Additionally, NHTSA recall 18V-524 (FCA U87) was issued for some 2019 Cherokees for a faulty voltage regulator chip in the PCM that could cause a no-start condition.
   How to confirm: This is typically a last resort after all other possibilities (wiring, relays, grounds) have been ruled out. A professional will need to use an advanced scan tool to test the PCM's output driver and check if a software update per TSB 18-020-21 is required. Check vehicle VIN for applicability of recall U87.
   Typical fix: The PCM must be reprogrammed with the latest software or, if physically damaged or subject to recall U87, replaced and programmed for the vehicle's VIN.
   Est. part cost: $600-$1200

Rare But Worth Checking

• Faulty Ignition Switch: An internal short in the ignition switch could potentially keep the starter signal circuit energized, though this is less common than relay or wiring failures.
• Defective Starter Motor/Solenoid: An internal short within the starter solenoid can sometimes feed voltage back into the control circuit, triggering the code.

Diagnosis Steps

1. Check the battery voltage to ensure it is within the normal range (approx. 12.4-12.6V with engine off) and that terminals are clean and tight.
2. Scan the PCM for any other trouble codes. Note if P0607 is present, as this points towards a PCM issue per TSB 18-020-21.
3. Locate the starter relays (K1 and K3) and the starter fuse (F19, 40A) in the 🎬 Watch: How to find your starter fuse and relay location under-hood fuse box. Inspect the fuse and swap the K1/K3 relays with an identical relay (e.g., horn) to quickly test for relay failure.
4. Visually inspect all wiring and connectors between the fuse box, starter, and PCM. Look for any signs of damage, corrosion, or loose connections, paying close attention to the small signal wire on the starter solenoid.
5. Inspect the main battery ground and engine-to-chassis ground straps. Ensure they are clean, tight, and free of corrosion. A common problem area is the ground strap from the engine/trans to the chassis.
6. Using a multimeter, test the starter relay control circuit for voltage at the PCM connector C2, pin 29. There should be no voltage with the key off. If voltage is present, there is a short to power in the harness or a faulty PCM driver.
7. If all wiring, grounds, and relays test good, the fault may lie within the starter solenoid or the PCM itself. At this stage, professional diagnosis is recommended to test the PCM driver or perform software updates.

Parts You'll Likely Need

• Starter Relay (OEM #56029616AA) — This is the most common and easiest part to fail in the starter control circuit. It's a simple electromechanical switch that wears out over time.
  Trusted brands: Mopar, Standard Motor Products, Dorman
  OEM price range: $20-$40
  Aftermarket price range: $10-$25
• Engine Ground Cable (OEM #68371295AB) — A broken or corroded ground cable is a documented cause of no-start conditions on this platform and can trigger various electrical fault codes, including P0617.
  Trusted brands: Mopar
  OEM price range: $40-$75
  Aftermarket price range: $20-$50
• Powertrain Control Module (PCM) — If the code is accompanied by P0607 and all other circuit components are verified as good, the internal PCM driver has likely failed or requires a software update per TSB 18-020-21. It could also be a hardware failure covered under NHTSA recall U87.
  Trusted brands: Mopar (new or remanufactured)
  OEM price range: $800-$1200
  Aftermarket price range: $500-$900 (remanufactured)

Related Codes That Often Appear With This One

• P0616 — This code is for 'Starter Control Circuit Low'. Seeing both P0616 and P0617 can indicate an intermittent wiring problem, a failing relay, or a failing PCM driver.
• P0607 — This code means 'Control Module Performance'. As cited in TSB #18-020-21, its appearance with P0617 strongly suggests the root cause is a failing PCM or a software issue, rather than a simple circuit fault.

Technical Service Bulletins (TSBs) & Recalls

• 18-020-21: This TSB, dated Feb 16, 2021, involves reprogramming the PCM with updated software. It addresses a long list of potential DTCs, including P0617 (Starter Control Circuit High) and P0607 (ECU Internal Performance), for 2019 Cherokees with the 3.2L V6 engine. This indicates a known software-related cause for these faults.

Platform-Specific Known Issues

• TSB #18-020-21 notes that code P0617 can appear alongside P0607 (ECU Internal Performance), and a PCM software update may be required to fix a host of electrical DTCs.
• There are documented cases for the Jeep Cherokee (KL) platform where a no-start condition, sometimes with other electrical fault messages, was caused by a broken or corroded main ground cable terminal at the engine block or chassis.
• NHTSA Safety Recall U87 / 18V-524 affects some 2019 Cherokees, involving a faulty voltage regulator chip within the PCM that can lead to a no-start, stalling, and potential setting of related DTCs like P0617.

Mechanic-Grade Diagnostic Values

• Starter Signal (STA) Status vs. Vehicle State — expected: The starter signal should only be 'ON' during engine cranking and 'OFF' at all other times, especially when driving.. Failure: If the starter signal is 'ON' while vehicle speed is >12 mph and engine RPM is >1000, it will trigger P0617.
• Voltage at PCM Connector C2, Pin 29 (Starter Relay Control) — expected: Approximately 0V with key off. Should switch to battery voltage only when the key is turned to the 'START' position.. Failure: Voltage present at Pin 29 with the key off indicates a short to power in the harness or a failed PCM driver.
• Resistance of Starter Relay Control Circuit to Ground — expected: 10 kΩ or higher.. Failure: A low resistance reading indicates a short to ground in the circuit.

Scan Tool Commands That Help

• wiTECH: Data List > 'STARTER SIG' or 'Starter Signal' — Use this to monitor the live status of the starter signal that the PCM is receiving. This is critical for diagnosing if the signal is stuck 'ON' intermittently or while driving, which is a specific trigger condition for P0617.

Wiring & Ground Locations

• PCM Connector C2, Pin 29 — This is one of the main connectors on the Powertrain Control Module (PCM).. This specific pin is the 'Starter Relay Control' circuit output from the PCM. Testing for voltage here directly confirms if the PCM is commanding the relay or if there is a short in the circuit. The wire color is typically Dark Green/Gray (DG/GN).
• Starter Solenoid Pigtail Connector — On the starter motor itself, where the small signal wire attaches.. This connector and its wiring are exposed to significant heat and vibration from the engine and exhaust, making it a common point for corrosion, melting, or wire breaks that can cause shorts or open circuits.

Real Owner Repair Stories

• YouTube Channel 'Auto Repair Quest' (2019 Jeep Cherokee) — No crank, no start condition. Vehicle shut down while driving.
  ❌ Tried (didn't work) Initial diagnosis pointed towards PCM or related fuses.
  ✅ What actually fixed it The mechanic found a poorly installed aftermarket remote start system with wires improperly spliced into the starter circuit harness. After removing the aftermarket device and repairing the original wiring, the vehicle started. The starter motor was also replaced as a precaution due to the electrical faults. This highlights how aftermarket modifications can cause this code.

Model Year Variations Within This Range

• 2019: A subset of 2019 Jeep Cherokee models are included in NHTSA Safety Recall U87 / 18V-524. These vehicles may have a PCM with a faulty voltage regulator chip. This specific manufacturing defect can cause a no-start, stall-after-start, or engine stall while driving, which could manifest as a P0617 code. Diagnosis should include checking the vehicle's VIN against this recall.