P1628 RAM Code - Sensor Reference Voltage 2 Circuit Erratic
Quick Answer
The Diagnostic Trouble Code (DTC) will be set when the Powertrain Control Module (PCM) detects that the 5-Volt Supply circuit voltage is below the minimum acceptable value. Common causes include Faulty 5-Volt Sensor, 5-Volt Sensor harness is open or shorted, 5-Volt Sensor 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
- P1628 RAM indicates Sensor Reference Voltage 2 Circuit Erratic.
- Common causes
- Common causes include Faulty 5-Volt Sensor, 5-Volt Sensor harness is open or shorted, 5-Volt Sensor 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 P1628 RAM Description
What are the Possible Causes of the DTC P1628 RAM?
- Faulty 5-Volt Sensor
- 5-Volt Sensor harness is open or shorted
- 5-Volt Sensor circuit poor electrical connection
How to Fix the DTC P1628 RAM?
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 P1628 RAM 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.
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Frequently Asked Questions about P1628 RAM Code
1. What does the OBDII code P1628 mean in a RAM vehicle?
P1628 indicates an issue with the Sensor Reference Voltage 2 Circuit, where the voltage is behaving erratically or is outside the expected range.
2. What are the common symptoms of the P1628 code in a RAM?
Symptoms may include an illuminated check engine light, engine performance issues, erratic sensor readings, or the vehicle entering limp mode.
3. What causes the P1628 code to trigger in a RAM?
Common causes include a faulty sensor, damaged wiring, poor electrical connections, or a malfunctioning powertrain control module (PCM).
4. Can a bad PCM cause the P1628 code in a RAM?
Yes, a malfunctioning PCM or its internal circuitry can cause erratic behavior in the Sensor Reference Voltage 2 Circuit, leading to the P1628 code.
5. How can I diagnose the P1628 code on my RAM?
Start by checking the wiring and connectors for damage or corrosion, test the affected sensors, and use a multimeter to verify the reference voltage in the circuit.
6. Is it safe to drive with the P1628 code active in my RAM?
Driving with this code may lead to poor engine performance or limp mode. It's best to address the issue promptly to avoid further damage.
7. What sensors are typically associated with the P1628 code on a RAM?
The code may affect sensors that rely on the Sensor Reference Voltage 2 Circuit, such as MAP sensors, throttle position sensors, or other engine-related sensors.
8. How can I fix the P1628 code on my RAM?
Repairs may include fixing damaged wiring, cleaning or replacing corroded connectors, replacing faulty sensors, or reprogramming or replacing the PCM if necessary.
9. Can a low battery cause the P1628 code on a RAM?
A low battery is unlikely to directly cause this code, but poor voltage regulation or electrical issues in the circuit can contribute to it.
10. How much does it cost to repair the P1628 code on a RAM?
Repair costs vary depending on the root cause, ranging from $50 for a wiring fix to $1,000 or more for PCM replacement and reprogramming.
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