P1618 on Volvo
Manufacturer-Specific Code (Chrysler/Dodge/RAM: Sensor Reference Voltage 1 Erratic)
P1618 on Volvo vehicles indicates manufacturer-specific code (chrysler/dodge/ram: sensor reference voltage 1 erratic). Au7o has documented this code across 2 Volvo models — most commonly on S60, XC70. P1618 is a manufacturer-specific powertrain code, most associated with Chrysler/Dodge/RAM. It generally indicates the PCM detected that the primary 5-volt sensor reference supply (Reference Voltage 1) is varying too much or too quickly. Many sensors share this reference, so an erratic supply can cause multiple sensor readings to fluctuate, leading to rough idle, stalling, or poor performance. The exact circuit should be confirmed against the specific vehicle's service data. Typical repair costs on Volvo range from $200 to $700, depending on the specific model and root cause.
Common Causes of P1618
- •Shorted or chafed sensor reference wiring
- •A failing sensor loading down the 5V reference circuit
- •Corroded or loose sensor connectors
- •Water intrusion in a connector on the reference circuit
- •Poor ground affecting the reference supply
- •PCM internal fault (less common)
P1618 on Volvo by Model
Volvo S60(1 issue)
- Electronic Throttle Module (ETM) Failure2001-2004
The 2001-2004 S60 (and other P2 platform Volvos) is notorious for ETM failure due to a design flaw in the throttle body electronics. The module develops internal solder joint cracks and corroded contacts, causing the car to enter limp mode, stall at idle, or refuse to accelerate. Volvo issued an extended warranty covering ETMs up to 10 years/200,000 miles, but many are now beyond that coverage.
Volvo XC70(1 issue)
- Electronic Throttle Module (ETM) Failure2001-2004
The ETM fails due to internal solder joint cracking, causing reduced power, limp mode, and check engine light. This is the same issue that affects all Volvo P2 platform vehicles (S60, V70, XC70). Volvo extended warranty coverage in some markets.
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View P1618 across all makes →Frequently Asked Questions
What does P1618 mean on Volvo?▼
P1618 stands for "Manufacturer-Specific Code (Chrysler/Dodge/RAM: Sensor Reference Voltage 1 Erratic)." P1618 is a manufacturer-specific powertrain code, most associated with Chrysler/Dodge/RAM. It generally indicates the PCM detected that the primary 5-volt sensor reference supply (Reference Voltage 1) is varying too much or too quickly. Many sensors share this reference, so an erratic supply can cause multiple sensor readings to fluctuate, leading to rough idle, stalling, or poor performance. The exact circuit should be confirmed against the specific vehicle's service data. On Volvo specifically, this code is documented across 2 models.
What causes P1618 on Volvo vehicles?▼
Common causes on Volvo: Shorted or chafed sensor reference wiring, A failing sensor loading down the 5V reference circuit, Corroded or loose sensor connectors, Water intrusion in a connector on the reference circuit, Poor ground affecting the reference supply. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1618 on a Volvo?▼
Repair costs on Volvo range from $200 to $700, depending on the specific model and root cause.
Which Volvo models have P1618 documented?▼
Au7o has documented P1618 on 2 Volvo models: S60, XC70.