P0642 KIA Code - Sensor Reference Voltage 'A' Circuit Low
Quick Answer
The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0642 KIA indicates Sensor Reference Voltage 'A' Circuit Low.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0642 KIA Description
What are the Possible Causes of the DTC P0642 KIA?
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
How to Fix the DTC P0642 KIA?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0642 KIA code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0642 KIA code?
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Frequently Asked Questions about P0642 KIA Code
What does the OBDII code P0642 mean for a Kia vehicle?
P0642 indicates a low voltage issue in the Sensor Reference Voltage 'A' circuit, which affects sensors that rely on a stable reference voltage from the engine control module (ECM).
What are the common symptoms of a P0642 code on a Kia?
Symptoms may include poor engine performance, reduced fuel efficiency, illuminated check engine light, erratic sensor readings, or difficulty starting the vehicle.
What causes the P0642 code on a Kia?
Common causes include a short circuit in the sensor wiring, a faulty sensor, damaged ECM, corroded or loose electrical connections, or issues with the power supply to the reference circuit.
Can a faulty ECM cause the P0642 code on a Kia?
Yes, a malfunctioning ECM can lead to improper regulation of the reference voltage and trigger the P0642 code.
How do you diagnose the P0642 code on a Kia?
Diagnosis involves inspecting sensor wiring for damage, testing the voltage output of the reference circuit, checking electrical connections, and scanning for related fault codes.
Can driving with a P0642 code cause further damage to a Kia?
Yes, driving with this code may lead to erratic sensor behavior, which can affect engine performance and potentially damage components over time.
What sensors are typically affected by the P0642 code?
Sensors like the throttle position sensor, MAP sensor, or other components relying on the 'A' reference voltage circuit may be impacted.
How can the P0642 code be fixed on a Kia?
Repairs may involve replacing damaged wiring, faulty sensors, or the ECM, cleaning corroded connections, or resolving short circuits in the reference voltage circuit.
How much does it typically cost to fix a P0642 code on a Kia?
Repair costs vary depending on the root cause but may range from $100 for minor wiring repairs to $1,000 or more for ECM replacement.
Can a dirty throttle body trigger the P0642 code on a Kia?
While unlikely, a dirty throttle body could indirectly affect sensor readings, but the code is primarily related to electrical issues in the reference voltage circuit.
Discuss the causes and fixes for P0642 KIA OBDII Code
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P0642 kia Rio (2013) .... Engine light is on. The car makes cranky noise from the engine, vibrates when its on reverse gear and stalls or fail in acceleration..
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I checked a national database of repairs for your model year, but there is no more information. Usually, if you have the P0642 code you get the engine light, but no mechanical problems. Sounds like you have an engine mechanical problem.
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