Tech Tip: Volvo Alternator Charging Problems

Tech Tip: Volvo Alternator Charging Problems

A 1999-2002 S60, S80, V70 or XC70 model may exhibit alternator charging problems. Analysis of damaged alternators shows that the regulator may get damaged due to extreme weather conditions with high temperature and high humidity. The regulator may fail in two phases.

A 1999-2002 S60, S80, V70 or XC70 model may exhibit alternator charging problems. Analysis of damaged alternators shows that the regulator may get damaged due to extreme weather conditions with high temperature and high humidity. The regulator may fail in two phases.

Early failure phase:
• Normal charge when the engine is cold;
• Low charge (10-11 volts) when the charge regulator is hot (after 20-30 minutes driving, with high alternator charging current);
• Poor or discharged battery, with no-start conditions; and/or
• Charge indicator in DIM only when battery voltage is low.

Late failure phase:
Later, the regulator may break down and cease to function, and the following conditions may apply.
• No charging or overcharging;
• Poor or discharged battery, with no-start conditions;
• Vehicle may stop during driving (due to discharged battery);
• Message in DIM LOW BATTERY VOLTAGE or CHECK EL SYST;
• One or more DTCs: CEM: 0C01,0C02,0C04,0C05. ECM: 801D,91E0. ABS: 0074,0077; and/or
• Charge indicator in DIM when DTC is set.

A new type of regulator (P/N 8637851) was introduced in production from model year 2003.

Service:
The new regulator (P/N 8637851) also fits the older alternators that previously used the regulator (P/N 9459741). This regulator can be used on all S60, S80, V70 and XC70 models.

Replace the regulator. Refer to VADIS for methods.

For additional information, visit www.alldata.com.

Technical service bulletin courtesy of ALLDATA.

You May Also Like

Hunter’s Latest Wheel Alignment Specs Database Now Available

The semi-annual specification update includes 960+ new and updated vehicles.

Wheel Alignment Specs Database

Hunter Engineering announced its newly updated vehicle information database is now available for Hunter WinAlign alignment users.

Effective Nov. 1, the release covers new models — those not yet in existence at the time of the previous release this past spring — as well as model year updates, covering OEM changes to existing vehicles.

Federated Giveaway Brings Holiday Cheer

Facebook contest gives away limited edition diecast collectible.

Mitchell 1 Brings Back ‘Thank You Thursdays!’ Sweepstakes

Sweepstakes shows appreciation for automotive service professionals.

asTech Expands Remote OEM Solutions to Include Tesla

asTech’s diagnostic devices now offer authentic remote OEM scans on Tesla vehicles.

Kia EV Models Set All-Time October Sales Record

Kia’s EV6 sets an all-time October sales record.

Other Posts

New Colors for Mac Tools 2-pc. Silicone Tray Sets

Tray sets are now available in three additional hi-visibility colors.

BlackTop Chassis Coater Offers Durable Rust Protection

This easy-to-use coating can be applied directly to prepared metal, primed surfaces, and other paints and coatings.

Bar’s Leaks Tech Tips for Driving in a Winter Wonderland

Proper cooling system preparation helps prevent customers from getting stranded.

Toyota Adopts Tesla Charging Standard for Future EVs

Toyota will adopt the North American Charging Standard on its battery electric vehicles beginning in 2025.