GM TechLink 2007-11-52

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Voltmeter Fluctuation Some customers may comment that the volt gauge fluctuates between 12 and 14 volts on their 2005-08 full size pickup or utility vehicle. Some customers may comment that the volt gauge fluctuates between 12 and 14 volts on their 2005-08 full size pickup or utility vehicle. Starting with the 2005 model year, these vehicles are equipped with a Regulated Voltage Control (RVC) system. RVC reduces the targeted output voltage to 12.6-13.1 volts when in Fuel Economy Mode to improve fuel economy. The generator may exit Fuel Economy Mode if additional voltage is required. This causes the voltmeter to fluctuate between 12 and 14 volts (fig. 16) , as opposed to non-regulated systems which usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation. No repairs should be attempted. Refer to the owner manual Section 3 (Instrument Panel) Voltmeter Gage for more information. TIP: Refer to PIT4426 for concerns with keeping a camper or trailer battery properly charged.

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Source

Source: GM TechLink — Communication from a manufacturer to dealers (summary published by a government agency)
Reporter type: Manufacturer
Source reference: 2007-11-52
Country / market: US
Language: en
Document version: Version 1 (1 held)
Note on the source: Copyright General Motors Corporation. No licence is stated. Held as the headline and short quoted passages with the issue named and linked; the articles themselves are not stored or shown.

Dates

Incident date: Unknown
Received by source: 2007-11-01
Added to the source's file: Unknown: not returned by the source API
Issued / published: 2007-11-01
First observed: 2026-10-06 10:12 UTC (initial bulk load)
This version fetched: 2026-10-06 10:12 UTC